Embryology

Gittin 58 ~ Maternal Imprinting

From today’s rather sad page of Talmud comes this weird historical claim:

גיטין נח, א

מֵעִיקָּרָא, חֲשִׁיבִי דְרוֹמָאֵי הֲווֹ נָקְטִי בִּלְיוֹנָא דְגוּשְׁפַּנְקָא, וּמְשַׁמְּשִׁי עַרְסַיְיהוּ; מִכָּאן וְאֵילָךְ, מַיְיתוּ בְּנֵי יִשְׂרָאֵל וְאָסְרִי בְּכַרְעֵי דְּפוּרַיְיהוּ, וּמְשַׁמְּשִׁי

Initially the noblemen of Rome would keep an image imprinted on a seal by their beds and engage in sexual intercourse opposite that image, so that they would beget children of similar beauty. From this point forward, from the time of the Great Revolt, they would bring Jewish children, tie them to the foot of their beds, and engage in sexual intercourse across from them, because they were so handsome.

According to Rashi, these rings had images of beautiful people on them, and the hope was that the mother would become pregnant while looking at them:

בליוני דגושפנקי - צורות נאות שבחותמיהן כדי שתתעברנה כנגדן

All this is rather, strange, but not to a person who believed in maternal imprinting. Neither you nor I might not believe in such things, but pretty much everyone in the ancient and pre-modern world did. So today on Talmudology let’s take a deep look at the topic. And we begin with a red cow.

From here.

From here.

How to make a Red Heifer

The Parah Adumah, the red heifer, was used in several ceremonies in the Temple. It was, however, a rare animal. In today's page of Talmud there is a detailed discussion as to whether a red heifer born to an idol-worshipper could be used. The concern was that the heifer, or one of its ancestors, might have been used by the idol-worshipper for beastiality. Should this have happened, it was forbidden to use the red heifer as a sacrifice. The Talmud relates that in fact an idol-worshipper called Daba ben Natina had sold a red heifer to his Jewish neighbors. To insure that the heifer's mother had not been the object of beastiality, the pregnant cow had been watched "משעה שנוצרה" – from the moment it was impregnated. Then comes an obvious question: how could anyone be sure that the cow was indeed pregnant with a red calf which would warrant safeguarding her? Perhaps the calf  would be born another color? 

Here is the answer: "כוס אדום מעבירין לפניה בשעה שעולה עליה זכר" -"while the mother was copulating, the farmer would show her a red cup." That would insure that she would give birth to a little red calf that would grow into a bigger red heifer. The belief that what a mother sees during conception and gestation will affect her offspring is called maternal imprinting or psychic maternal impressions, or mental influence, or maternal imagination, or (my favorite) maternal fancy

The history of the belief in maternal impressions is one of great antiquity...it is also one of practically world-wide distribution. [It can be found in] such far apart lands as India, China, South America, Western Asia and East Africa..the Esquimaux, the Loango negros, and the old Japanese.
— John William Ballantyne. Teratogenesis: an Inquiry into the Causes of Monstrosities. Edinburgh, Oliver & Boyd 1897. 24

Maternal Imprinting in jewish sources

The earliest mention of maternal imprinting is the story of Yaakov and his division of the goats he watched for his uncle Lavan (Gen 30:25-43, 31:1-12).  As wages, Yaakov asked for all the speckled goats, while Lavan would get to keep the plain ones.  Yaakov then took several wooden rods from which he peeled the bark, and left these now speckled rods in front of a water trough.   The female goats stared at the rods while they are drinking and mating, and this in turn caused them to give birth to speckled kids, all of which Yaakov got to keep. That's how maternal imprinting works.  

The Midrash and Talmud are replete with the belief in maternal imprinting. Perhaps the most famous story is that of Rabbi Yochanan (~180-279 CE) who would regularly sit in front of the mikveh (ritual bath). He did this so that women leaving there would see him, and be blessed with sons as handsome as he was.

בבא מציעא פד, א

ר' יוחנן הוה אזיל ויתיב אשערי טבילה אמר כי סלקן בנות ישראל מטבילת מצוה לפגעו בי כי היכי דלהוו להו בני שפירי כוותי גמירי אורייתא כוותי

Rabbi Yochanan would go and sit by the entrance to the ritual bath. He said to himself: When Jewish women come up from their immersion [after their menstruation,] they should see me first so that they have beautiful children like me, and sons learned in Torah like me. 

Rabbi Akiva used maternal imprinting to save a king from a rather embarrassing situation:

מדרש תנחומא נשה, ז

מַעֲשֶׂה בְּמֶלֶךְ הָעַרְבִים שֶׁשָּׁאַל אֶת רַבִּי עֲקִיבָא, אֲנִי כּוּשִׁי וְאִשְׁתִּי כּוּשִׁית וְיָלְדָה לִי בֵּן לָבָן, הוֹרְגָהּ אֲנִי, שֶׁזָּנְתָה תַּחְתַּי. אָמַר לוֹ: צוּרוֹת בֵּיתְךָ שְׁחֹרוֹת אוֹ לְבָנוֹת. אָמַר לוֹ: לְבָנוֹת. אָמַר לוֹ: כְּשֶׁהָיִיתָ עוֹסֵק עִמָּהּ, עֵינֶיהָ נָתְנָה בְּצוּרוֹת לְבָנוֹת וְיָלְדָה כַּיּוֹצֵא בָּהֶם. וְאִם תָּמֵהַּ אַתָּה בַּדָּבָר, לְמַד מִן צֹאנוֹ שֶׁל יַעֲקֹב, שֶׁמִּן הַמַּקְלוֹת הָיוּ מִתְיַחֲמוֹת, שֶׁנֶּאֱמַר: וְיִחֲמוּ הַצֹּאן אֶל הַמַּקְלוֹת (בראשית ל, לט). וְהוֹדָה מֶלֶךְ הָעַרְבִים וְשִׁבַּח לְרַבִּי עֲקִיבָא

A king of Arabia once asked Rabbi Akiva, “I am black and my wife is black, yet she gave birth to a white child. Shall I have her executed for infidelity?” Rabbi Akiva responded by inquiring if the statues in his house where white or black. He said to Rabbi Akiva that they were white.  Rabbi Akiva explained to the king that during conception his wife's eyes were fixed on the white statues and so she bore a white child...the king agreed and praised Rabbi Akiva

Maternal Imprinting in Greek Thought, and Beyond

In 1998 Professors Wendy Doniger and Gregory Spinner published perhaps the most comprehensive review of imprinting, in a paper titled Misconceptions: Female Imaginations and Male Fantasies in Parental Imprinting. They noted Empedocles, who lived in the fifth century BCE, wrote that 

the fetuses are shaped by the imagination of the women around the time of conception. For often women have fallen in love with statues of men, and with images, and have produced offspring which resemble them.

Soranus of Ephesus, another Greek physician who lived in Rome and Alexandria (and who was a contemporary of Rabbi Yochanan) firmly believed in imprinting, both for animal husbandry and in humans:

Some women, seeing monkeys during intercourse, have borne children resembling monkeys. The tyrant of the Cyprians, who was misshapen, compelled his wife to look at beautiful statues during intercourse and became the father of well-shaped children; and horse-breeders, during covering, place noble horses in front of the mares.

Let's jump forward a millennium.   In 1282 it was reported that an infant was born with hair and claws like a bear. The Pope at the time "straightway ordered the destruction of all pictures of bears in Rome." This story is from John Ballantyne, a Scottish physician who in 1897 published Teratogenesis: an Inquiry into the Causes of Monstrosities. According to Ballantyne, in the seventeenth century, the belief in maternal impressions "reigned supreme."  Here is another example of the kind of thing it led to:

 

And then things get even weirder:

In 1726 the matter of maternal impressions was brought still more prominently before the profession and the public in England in connexion [sic] with the notorious case of an "Extraordinary Delivery of Rabbets" which was alleged to have occurred in the case of Maria Tofts of Godlyman in Surrey; she had a great longing for 'Rabbets"in early pregnancy.

Pregnancy and the fetus

Maternal imprinting is a rather extreme form of what we all know to be true; that what happens to a pregnant mother affects the fetus she is carrying. Here are two of the countless examples of this.  If a mother drinks enough alcohol while pregnant, the fetus will be born with Fetal Alcohol Syndrome. This syndrome includes facial abnormalities, growth delays, abnormal development of organs, and reduced immunity.  If a mother is infected with measles (rubella) early in pregnancy, the baby will likely be born with congenital rubella syndrome, which includes cataracts, congenital heart disease and brain damage.  But these examples do not imply that a woman who eats eggs will have children with large eyes or that a woman who eats an esrog will have fragrant children, as the Talmud (Ketuvot 60b) declares. Some things a pregnant mother does will have a huge effect on the fetus she carries. Some won't have any affect at all.  

John Ballantyne, the Scottish physician concluded his book noting, as we have, that of course there are some things a mother does that will affect fetal outcome. "To this extent" he wrote, "I believe in the old doctrine of maternal impressions; this is, I think, one grain of truth in an immense mass of fiction and accidental coincidence."

It's not the red cup after all

Red cup.jpeg

Let’s return to the red heifer. It would seem that all you needed to produce a Parah Adumah was to place a red cup next to the mating cattle.  So why didn't every farmer use the red cup protocol to breed a red heifer? After all, these animals commanded fantastic prices because of their rarity. The answer offered by the Talmud is that the red cup protocol only worked with a herd of cattle that were known (במוחזקת) to produce red heifers.  Without that breeding history, the red cup protocol was useless. So this really wasn't about the red cup. It was about the genes, and that's the kind of parental imprinting that really does work.

A surprising large number of people, in different cultures and over many centuries, have believed that a woman who imagines or sees someone other than her sexual partner at the moment of conception may imprint that image upon her child- thus predetermining its appearance, character or both.
— Doniger W. Spinner G. Female Imaginations and Male Fantasies in Parental Imprinting. Daedalus 127 (1), No. 1, Science in Culture (Winter, 1998). 97-129

[Special thanks to Rabbi Dr. Eddie Reichman, medical historian and Talmudology reader who has been researching maternal imprinting for years, and was kind enough to share his material.]

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Sotah 45b ~ Talmudic Embryology

As we approach the end of Sotah, we turn our attention to a new topic: theories of embryonic development, and compare talmudic views with those of modern science. Here is what this page of Talmud - daf yomi - has to say on the topic:

סוטה מה, ב

מהיכן הולד נוצר מראשו וכן הוא אומר ממעי אמי אתה גוזי ואומר גזי נזרך והשליכי וגו' אבא שאול אומר מטיבורו ומשלח שרשו אילך ואילך

From where is the fetus formed? From its head, as the verse says (Ps.71:6): "From my mother's womb you pulled me out (gozi)". And it says later (Jeremian 7:29) "Pull out (gozi) your hair and throw it away.." [This second verse shows that the verb goz is used to describe the head. So the verse from Psalms must also refer to the head. According to Rashi the verse in Psalms should be read as "You formed me from my head."] Abba Shaul says that the fetus is created from its navel, and from there it sends out roots in all directions. (Sotah 45b)

Embryonic Development in Antiquity

In 1934, Joseph Needham, a British historian and embryologist, published A History of Embryology, in which he traced the history of how the embryo was thought to develop from antiquity to modern times. In this fascinating book we learn that Hippocrates (c. 460-370 BCE) believed that the fetus was formed by extracting breath from its mother, and that a series of small fires within the uterus gave rise to the bones and other organs of the embryo.  Aristotle (384-322 BCE) added some details about the role of the umbilical cord.  According to Needham, Aristotle understood that the role of the umbilicus was to nourish the fetus: The vessels of the umbilicus join onto the uterus like the root of a plant and through the cord the fetus receives its nourishment. Elsewhere, Aristotle claims that head of the fetus forms first. Galen (c. 129-216 CE) also used the analogy of the umbilicus serving like the root of a plant.  According to Galen, the embryo grew from menstrual blood, and then from the blood that nourished it through the umbilical cord.

What Actually Happens

Development of the Umbilical cord. A: The posterior body wall is established. B: the vitelline duct form as the cells form a head and tail end, fold inwards on their lateral sides. C: The umbilical cord forms as the yolk sac and vitelline duct fuse.…

Development of the Umbilical cord. A: The posterior body wall is established. B: the vitelline duct form as the cells form a head and tail end, fold inwards on their lateral sides. C: The umbilical cord forms as the yolk sac and vitelline duct fuse. From O'Donnell K. Glick P, Caty M. Pediatric Umbilical Problems. Pediatric Clinics of North America. 1988 24 (1) 792.

At its earliest stage the embryo consists of a sheet of cells, an amniotic cavity and a yolk sac. The sheet of cells develops a head (cranial) and bottom (caudal) end, and grows around most of the yolk sac. This enclosed yolk sac then grows into the gut of the embryo.  The part of the yolk sac that is not surrounded by the embryo is still connected to it by a thin tube called the vitelline duct.  This duct then fuses with the contained yolk sac, and forms a larger bundle of vessels we call the umbilical cord. This occurs between the 4th-8th week of gestation (calculated from the first day of the last menstrual cycle).  

It is clear then, that embryo does not grow from the head or from umbilical cord.  As you can see from the diagram, the fetus do not grow from the head. In fact the head develops from the early cells of the embryo as it takes on a cranial-caudal polarity, sometime around 3-4 weeks gestation, when the embryo is about 3mm in length. Neither does the embryo grow from the umbilical cord, as Abba Shaul claimed. In fact it is the umbilical cord that grows out from the early embryo, and not the other way around. (For more on talmudic embryology, see Samuel Kottek's 1981 paper Embryology in Talmudic and Midrashic Literature.)

As we will see in more detail in the winter of 2019, talmudic embryology reflected the prevailing Greek theories of the times. But those theories developed without the benefit of microscopes and the other tools later available to scientists. It was perfectly reasonable to claim that the embryo grew from its head, since even in antiquity the importance of the head for life was clear. No less unreasonable was the view that the embryo grew from the umbilical cord, for that cord does in fact sustain the embryo as it grows and matures inside the womb. But two wrong but reasonable theories does not make one correct one. Sometimes however, the rabbis of the Talmud were spot on with their embryology. For example, here is Rav Simlai (3rd century CE, and the rabbi who brought you the famous count of 613 commandments) describing how the fetus sits within the womb.  Compare his words below with the famous sketch of Leonardo Da Vinci.Then answer this question: How did he know?

R. Simlai delivered the following discourse: What does an embryo resemble when it is in the bowels of its mother? Folded writing tablets. Its hands rest on its two temples, its two elbows on its two legs and its two heels against its buttocks. Its head lies between its knees, its mouth is closed and its navel is open, and it eats what its mother eats and drinks what its mother drinks...
— Niddah 30b
Leonardo Da Vinci. Studies of the Fetus in the Womb. Drawn between 1510-1513.

Leonardo Da Vinci. Studies of the Fetus in the Womb. Drawn between 1510-1513.

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Yoma 85a ~ Talmudic Embryology

In a dispute about whether death is a cessation of breathing or a cessation of the heartbeat, the Talmud suggests that a parallel may be drawn to another dispute, this one concerning the growth of a human embryo:

יומא פה, א

נֵימָא הָנֵי תַּנָּאֵי כִּי הָנֵי תַּנָּאֵי. דְּתַנְיָא: מֵהֵיכָן הַוָּלָד נוֹצָר — מֵרֹאשׁוֹ, שֶׁנֶּאֱמַר: ״מִמְּעֵי אִמִּי אַתָּה גוֹזִי״, וְאוֹמֵר: ״גזִּי נִזְרֵךְ וְהַשְׁלִיכִי״. אַבָּא שָׁאוּל אוֹמֵר: מִטִּיבּוּרוֹ, וּמְשַׁלֵּחַ שָׁרָשָׁיו אֵילָךְ וְאֵילָךְ

Let us say that the dispute between these tanna’im who disagree about checking for signs of life is like the dispute between these tanna’im who disagree about the formation of the embryo. As it was taught in a baraita: From what point is the embryo created? It is from its head, as it is stated: “You are He Who took me [gozi] out of my mother’s womb” (Psalms 71:6), and it says: “Cut off [gozi] your hair, and cast it away” (Jeremiah 7:29). [These verses suggest that one is created from the head, the place of the hair.] Abba Shaul says: A person is created from his navel, and he sends his roots in every direction until he attains the image of a person.

So today we will discuss Talmudic embryology, and focus on the question of how, exactly, the growing embryo forms.

Let’s start with a passage found in the tractate Niddah, that beautifully describes the way a growing fetus lays within the womb.

נדה ל, ב

דרש רבי שמלאי למה הולד דומה במעי אמו לפנקס שמקופל ומונח ידיו על שתי צדעיו שתי אציליו על ב' ארכובותיו וב' עקביו על ב' עגבותיו וראשו מונח לו בין ברכיו ופיו סתום וטבורו פתוח ואוכל ממה שאמו אוכלת ושותה ממה שאמו שותה

Leonardo Da Vinci. Studies of the Fetus in the Womb. Drawn between 1510-1513.

R. Simlai delivered the following discourse: What does an embryo resemble when it is in the bowels of its mother? Folded writing tablets. Its hands rest on its two temples, its two elbows on its two legs and its two heels against its buttocks. Its head lies between its knees, its mouth is closed and its navel is open, and it eats what its mother eats and drinks what its mother drinks...

Talmudic embryology reflected the prevailing Greek theories of the times. But those theories developed without the benefit of microscopes and the other tools later available to scientists. Despite this, sometimes the rabbis of the Talmud were spot on with their embryology. The statement of Rav Simlai is a good example. (He lived in 3rd century CE, and is the rabbi who brought you the famous count of 613 commandments.) It is a perfect description of a growing fetus, written as if Rav Simlai was looking at Leonardo Da Vinci’s famous sketch. But his was not the only talmudic description of a how a fetus grows, so let’s look at some others.

Will the real Abba Shaul please stand up?

As we read on this page of Talmud, Abba Shaul declared that the fetus grows from its navel:

יומא פה,א

מהיכן הולד נוצר מראשו וכן הוא אומר ממעי אמי אתה גוזי ואומר גזי נזרך והשליכי וגו' אבא שאול אומר מטיבורו ומשלח שרשו אילך ואילך

From where is the embryo formed? From its head, as the verse says (Ps.71:6): "From my mother's womb you pulled me out (gozi)". And it says later (Jeremiah 7:29) "Pull out (gozi) your hair and throw it away.." Abba Shaul says that the fetus is created from its navel, and from there it sends out roots in all directions.

But elsewhere Abba Shaul has a different theory:

נדה כה, א

אבא שאול אומר תחלת ברייתו מראשו

Abba Shaul says: The beginning of the formation of the embryo is from its head

The contradiction between these two statements was noted by the great French medieval commentator Yakov ben Meir, known as Rabbenu Tam (d. 1174). He suggested that there is an error in the text before us: In Niddah, it should not read “from its head (מראשו), but “like a locust” (כרשון). Indeed this is the reading found in the important medieval dictionary Sefer HaAruch and echoed centuries later in Marcus Jastrow’s dictionary.

תוספות נדה כה,א, ד’ה תחלת ברייתו מראשו

תימה דבפ' בתרא דסוטה (דף מה:) קסבר אבא שאול תחלת ברייתו מטיבורו ומשלח שרשיו אילך ואילך ונראה לר"ת דגרס כרשון וכן פר"ח ובתוספתא פירש כעין חגב דסלעם מתרגמינן רשון וכן משמע דמיירי בשיעור האברים

Rabbenu Tam’s explanation makes a great deal of sense and leaves Abba Shaul with only one opinion: the fetus develops from the navel. This is not exactly what actually occurs, but to the naked eye it is not too far from it. Interestingly, Maimonides declined to take a position on the matter, and wrote simply that “at the beginning, the body of a person is the size of a lentil…”(תְּחִלַּת בְּרִיָּתוֹ שֶׁל אָדָם גּוּפוֹ כַּעֲדָשָׁה).

The Talmudic Sages,being true polyhistors, took into account experimental biology as well as popular beliefs.
— Kottek S. Embryology in talmudic and Midrashic Literature. Journal of the History of Biology 1981. 14 (2): 299-315.

Embryonic Development in Antiquity

In 1934 the British historian and embryologist Joseph Needham published A History of Embryology, in which he traced theories of embryonic development from from antiquity to modern times. In this fascinating book we learn that Hippocrates (c. 460-370 BCE) believed the fetus was formed by extracting breath from its mother, and that a series of small fires within the uterus gave rise to the bones and other organs of the embryo. According to Needham, Aristotle (384-322 BCE) understood that the role of the umbilicus was to nourish the fetus. The vessels of the umbilicus join onto the uterus like the root of a plant and through the cord the fetus receives its nourishment. Elsewhere, Aristotle claimed (contra Abba Shaul) that head of the fetus forms first. Galen (c. 129-216 CE) also used the analogy of the umbilicus serving like the root of a plant. According to him the embryo grew from menstrual blood, and then from the blood that nourished it through the umbilical cord.

What Actually Happens -not from THE head or from the navel

Development of the Umbilical cord. A: The posterior body wall is established. B: the vitelline duct form as the cells form a head and tail end, fold inwards on their lateral sides. C: The umbilical cord forms as the yolk sac and vitelline duct fuse. From O'Donnell K. Glick P, Caty M. Pediatric Umbilical Problems. Pediatric Clinics of North America. 1988 24 (1) 792.

At its earliest stage the embryo consists of a sheet of cells, an amniotic cavity and a yolk sac. The sheet of cells develops a head (cranial) and bottom (caudal) end, and grows around most of the yolk sac. This enclosed yolk sac then grows into the gut of the embryo.  The part of the yolk sac that is not surrounded by the embryo is still connected to it by a thin tube called the vitelline duct.  This duct then fuses with the contained yolk sac, and forms a larger bundle of vessels we call the umbilical cord. This occurs between the 4th-8th week of gestation (calculated from the first day of the last menstrual cycle).  

It is clear then, that the embryo does not grow from the head or from umbilical cord.  As you can see from the diagram, the head develops from the early cells of the embryo as it takes on a cranial-caudal polarity, sometime around 3-4 weeks gestation, when the embryo is about 3mm in length. Neither does the embryo grow from the umbilical cord, as Abba Shaul claimed. In fact it is the umbilical cord that grows out from the early embryo, and not the other way around.

However well understood the process of fetal development may now be, pregnancy remains a time that is often fraught with uncertainty and insecurity. The rabbis of the Talmud articulated these fears with a prayer, that reminds us of the fragility of human development and the relief when it all goes well.

ברכות ס,א

שלשה ימים הראשונים יבקש אדם רחמים שלא יסריח משלשה ועד ארבעים יבקש רחמים שיהא זכר מארבעים יום ועד שלשה חדשים יבקש רחמים שלא יהא סנדל משלשה חדשים ועד ששה יבקש רחמים שלא יהא נפל מששה ועד תשעה יבקש רחמים שיצא בשלום

During the first three days after intercourse, one should pray that the seed not putrefy, [that it will fertilize the egg and develop into a fetus].

From the third day until the fortieth, one should pray that it will be male.

From the fortieth day until three months, one should pray that it will not be deformed, in the shape of a flat fish,

From the third month until the sixth, one should pray that it will not be stillborn.

And from the sixth month until the ninth, one should pray that it will be emerge safely.

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Eruvin 18a ~ Adam's Tail and the the Recapitulation of Phylogeny

On today’s page of Talmud we read the following:

כְּתִיב: ״וַיִּבֶן ה׳ אֱלֹהִים אֶת הַצֵּלָע וְגוֹ׳״, רַב וּשְׁמוּאֵל: חַד אָמַר פַּרְצוּף, וְחַד אָמַר זָנָב 

 it is written: “And the tzela, which the Lord, God, had taken from the man, He made a woman, and brought her unto the man” (Genesis 2:22). Rav and Shmuel disagree over the meaning of the word tzela: One said: It means a female face, from which God created Eve; and one said: Adam was created with a tail [zanav], which God removed from him and from which He created Eve.

The Talmud then investigates how the claim that Adam was created with a tail can be supported from the text of the Bible, and it is a discussion that need not concern us here. But Tosafot actually takes the time to consider which of the two explanations of the word tzela is correct, and concludes that it is the opinion that Primordial Man was indeed created with a tail, from which Primordial Eve was created.

The suggestion that for a time, Primordial Man had a tail is actually well known to those who study embryology and human development. To understand why, we need to take a detour into the thought of a German named Ernst Haeckel (1834-1919) who, at least according to Wikipedia, was a “zoologist, naturalist, eugenicist, philosopher, physician, professor, marine biologist, and artist.”

Ernst Haeckel - A warning

Before we go any further, we must point out that Haeckel was a social Darwinist, and an advocate of scientific racism. He believed that some human races were inferior to others, as this sample from his book The Wonder of Life makes abundantly clear:

These lower races (such as the Veddahs or the Australian negroes) are psychologically nearer to the mammals (apes or dogs) than to civilized Europeans; we must therefore assign a totally different value to their lives.

The fact that Haeckel thought that the Jews were located “at the same highly developed level as the Germans and within the same species” should not comfort us. Scientific racism is malodorous and to be fought at every turn, regardless of which race or group are claimed to be at the top. We, of all peoples, should know this to be true. So to quote Haeckel in a post about the Talmud might be just too distasteful for some. If this resonates with you, please read no further, and join us again for the next post, which will discuss telescopes. But if you can hold your nose for a while, read on and see why Haeckel springs to mind when learning that Adam was created with a tail.

[Haeckel’s] evolutionary racism; his call to the German people for racial purity and unflinching devotion to a ‘just’ state; his belief that harsh, inexorable laws of evolution ruled human civilization and nature alike, conferring upon favored races the right to dominate others ... all contributed to the rise of Nazism
— Stephen J. Gould . Ontogeny and Phylogeny. Harvard University Press 1977. 77.

Ontogeny Recapitulates Phylogeny

Haeckel’s contribution to science was his suggestion (now largely discredited or re-interpreted) that “ontogeny recapitulates phylogeny.” Ontogeny is the study of the organization and development of an organism; phylogeny is the study of how a species evolves. The meaning of this phrase boils down to this: as an organism grows inside the womb, or the egg or whatever, it goes through stages that mimic the previous development of its species over millions of years. The theory was especially pertinent to higher animals, like mammals, which, so the claim goes, go through embryological stages analogous to the adult stages of organisms from those species in its evolutionary history.

Haeckel believed that when you look very closely at the development of a human embryo, there are several stages in which it appears to have more in common with a fish, a species thought to have been ancestors of humans. His textbooks contained illustrations of this principal, like this one:

TOP LEFT: Dog (left) and human (right) embryos at 4weeksTOP RIGHT: Dog (left) at six weeks, human (right) at eight weeks.BOTTOM RIGHT:  Turtle (right) at six weeks, dog (left) at eight weeks.From Haeckel, E.

TOP LEFT: Dog (left) and human (right) embryos at 4weeks

TOP RIGHT: Dog (left) at six weeks, human (right) at eight weeks.

BOTTOM RIGHT: Turtle (right) at six weeks, dog (left) at eight weeks.

From Haeckel, E.

As you can see from the illustration, the dog and the human embryo resemble one another in the early stages of development, tails and all. Haeckel also observed that during a period of its development, the human embryo temporarily has slits on the sides of its neck, which resemble fish gills. This was an echo, he claimed, of our origins from fish.

Adam and his tail

So if Adam was created with a tail (as indeed Tosafot rules to be the case), does this lend support to the suggestion that ontogeny recapitulates phylogeny? Might the tail of the human embryo be an echo of this distant past in the Garden of Eden?

No. First, the creation story told in the opening of the Torah cannot be easily reconciled with the scientific understanding of human evolution. They are two different domains, and for every example where the order of creation seems to foreshadow what we now understand to be the story of the creation of the universe, there are many more examples that simply cannot be reconciled with our scientific understanding of how we got here. The great Rabbi Shimshon Raphael Hirsch (d. 1888) wrote that “it is not the aim of the Holy Scriptures to teach us astronomy, cosmogony or physics, but only to guide man to the fulfillment of his life’s task within the framework of the constellation of his existence.” To his list of things that the Torah does not teach us about, we should add evolution.

But there is a second reason why Adam’s tail cannot be found in the developing human embryo. It is because Haeckel seems to have been not altogether accurate in how he depicted the stages of development. Some have accused him of outright deception, while others more generously blame the poor equipment with which Haeckel had to work.

True human tails are rarely encountered in medicine. At the time when Darwin’s theory of evolution was a matter of debate, hundreds of dubious cases were reported. The presence of a tail in a human being was considered by evolutionists as an example that “ontogeny recapitulates phylogeny.” As the discussions on Darwin’s theory subsided, so did the reports on this interesting feature. A recent review summarized 33 cases of patients with a bona fide tail.
— Speigelman R. et al. The human tail: a benign stigma. J Neurosurg 63:461-462, 1985.

But humans do sometimes have tails

Sometimes babies are born with a defect that resembles a tail. Here, for example, is a photo from a 1985 case reported from the Department of Neurosurgery at The Chaim Sheba Medical Center and The Sackler School of Medicine in Israel.

From Speigelman R. et al. The human tail: a benign stigma. J Neurosurg 63:461-462, 1985.

From Speigelman R. et al. The human tail: a benign stigma. J Neurosurg 63:461-462, 1985.

The “tail” on this baby, and on others reported, contained no bones or vestigial spinal cord. It was largely made up of fatty (adipose) tissue, and did not connect to the spinal cord. It was removed surgically without incident.

The Israeli authors point out that the normal human embryo has a tail protruding from the trunk, and that

during the 7th to 8th week of embryogenesis, the tail regresses as the vertebrated portion retracts into the trunk and the caudal vertebrae fuse to form the coccyx. The nonvertebrated apex remains as a temporary pro- trusion, but finally also disappears. In 1901, Harrison suggested that the rare vestigial human tail probably arises from this distal, unvertebrated portion of the embryonic tail. This possibility could explain the two features noted in all reported human tails: namely, the lack of vertebrae and the absence of associated spinal cord malformations.

Another case report of a human tail, published in The New England Journal of Medicine in 1982, notes that this malformation provides no support for Haeckel’s theory. The rudimentary tail contains no bones, has no connection to the rest of the skeleton, and is often not even located in the midline. It is a reminder, the author claims, that some elements needed for the formation of a tail are somehow buried deep in our genes, because we are related to other tailed primates, from whom we diverged “some 25 million years ago.” Perhaps they are a rare reminder too that in Jewish thought, there is no shame in having a tail. Just ask Adam.

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