Blog: Science in the Talmud

אַחֵינוּ כָּל בֵּית יִשְׂרָאֵל

הַנְּתוּנִים בַּצָּרָה וּבַשִּׁבְיָה

הָעוֹמְדִים בֵּין בַּיָּם וּבֵין בַּיַּבָּשָׁה

הַמָּקוֹם יְרַחֵם עֲלֵיהֶם

וְיוֹצִיאֵם מִצָּרָה לִרְוָחָה

וּמֵאֲפֵלָה לְאוֹרָה

וּמִשִּׁעְבּוּד לִגְאֻלָּה

הָשָׁתָא בַּעֲגָלָא וּבִזְמַן קָרִיב

Berachot 43a ~ Musk and Ambergris

In a discussion about which blessings to say and when, the Talmud considers various kinds of fragrances.

ברכות מג, א

אָמַר רַבִּי חִיָּיא בְּרֵיהּ דְּאַבָּא בַּר נַחְמָנִי אָמַר רַב חִסְדָּא אָמַר רַב, וְאָמְרִי לַהּ אָמַר רַב חִסְדָּא אָמַר זְעֵירִי: כל הַמּוּגְמָרוֹת מְבָרְכִין עֲלֵיהֶן ״בּוֹרֵא עֲצֵי בְּשָׂמִים״ חוּץ מִמּוּשְׁק, שֶׁמִּין חַיָּה הוּא, שֶׁמְּבָרְכִין עָלָיו ״בּוֹרֵא מִינֵי בְּשָׂמִים״ 

Rabbi Chiyya, son of Abba bar Nachmani, said that Rav Chisda said that Rav said, and some say that Rav Chisda said that Ze’iri said: Over all the incense one recites: Who creates fragrant trees, except for musk, which is extracted from a living creature, and over which one recites: Who creates various spices.

The male musk deer Moschus moschiferus. Yes, the fangs are real. Image from here.

The male musk deer Moschus moschiferus. Yes, the fangs are real. Image from here.

Musk, at least the musk that was one used in the perfume industry, is a secretion from a gland of the male musk deer Moschus moschiferus. However the term “musk”now includes a number of different chemicals which all share a common, distinct, and typical aroma. Today, the perfume industry almost exclusively uses synthesized compounds, which is certainly good news for the cute deer. In fact since 1979 trade in musk from several countries has been banned by the Convention on International Trade in Endangered Species of Wild Fauna and Flora.

In her exhaustive monograph on the subject, Cornelia Sommer notes that musk gland is found near the rear end of the musk deer which lives in the upper regions of Eastern Asia, though presumably once had a far wider natural habitat. Discovery and use of musk date back to ancient China and pre-historic India, and as we learn today, it is mentioned in the Talmud. In order to get access to the natural musk, the animal must be killed to remove the gland, also called musk pod. The pods which weigh about 70g, contain about 40% musk. They are dried, and the reddish-brown paste inside them turns into a black, granular material called musk grain. The aroma of the tincture, which is described for example as animal-like, earthy, and woody, becomes more intensive during storage, and only after considerable dilution does the obtained extract exhibit a pleasant odor.

Because natural musk is rare and expensive, chemists started to synthesize an alternative centuries ago. In 1890 the German chemist Albert Baur succeeded in synthesizing the first chemically defined substance with musk odor, which he patented and commercialized as “Musc Baur.” (Apparently, the discovery was happenstance. Bauer was actually tiring to find a better explosive when he chanced upon the synthetic compound.) Other members of this class of compounds, called nitro musks, were later synthesized and gained considerable commercial importance. Thousands of tonnes of synthetic musks are now produced each year.

Perfume in the urine of the deer, and the excrement of the whale

In his commentary on the Talmud, the great medieval exegete Rashi suggests that the musk can be found in the excrement of an animal (מן הרעי של חיה). And he was not wrong, since the musk deer excretes it in his urine to mark his territory and attract a female. Another animal whose excreta was prized in the production of perfume was the whale, or specifically the sperm whale. For centuries it produced a fantastically expensive substance called ambergris (from the old French meaning grey amber), which is produced in the intestines of the whale and excreted into the ocean. There is spends years bobbing about minding its own business, undergoing oxidation and photodegradation until it washes up on land. It has “a peculiar odour that is at once sweet, earthy, marine, and animalic.” Like musk it is used to produce perfume. In is classic novel Moby Dick, Herman Melville has an entire chapter on the mysterious ambergris.

Now this ambergris is a very curious substance, and so important as an article of commerce, that in 1791 a certain Nantucket-born Captain Coffin was examined at the bar of the English House of Commons on that subject. For at that time, and indeed until a comparatively late day, the precise origin of ambergris remained, like amber itself, a problem to the learned. Though the word ambergris is but the French compound for grey amber, yet the two substances are quite distinct. For amber, though at times found on the sea-coast, is also dug up in some far inland soils, whereas ambergris is never found except upon the sea. Besides, amber is a hard, transparent, brittle, odorless substance, used for mouth-pieces to pipes, for beads and ornaments; but ambergris is soft, waxy, and so highly fragrant and spicy, that it is largely used in perfumery, in pastiles, precious candles, hair-powders, and pomatum. The Turks use it in cooking, and also carry it to Mecca, for the same purpose that frankincense is carried to St. Peter’s in Rome. Some wine merchants drop a few grains into claret, to flavor it.

Who would think, then, that such fine ladies and gentlemen should regale themselves with an essence found in the inglorious bowels of a sick whale! Yet so it is.
— Moby Dick chapter 93

The Elusive nature of Smell

In today’s page of Talmud, the rabbis consider the nature of smell.

״כֹּל הַנְּשָׁמָה תְּהַלֵּל יָהּ״ אֵיזֶהוּ דָּבָר שֶׁהַנְּשָׁמָה נֶהֱנֵית מִמֶּנּוּ וְאֵין הַגּוּף נֶהֱנֶה מִמֶּנּוּ? — הֱוֵי אוֹמֵר: זֶה הָרֵיחַ

“Let every soul praise the Lord” (Psalms 150:6). What is it from which the soul derives benefit and the body does not derive benefit from it? You must say: That is scent. Even over items from which only the soul derives benefit, one must recite a blessing and praise God.

According to the rabbis, this intangible sense leaves its mark not on the body, but on the soul. How remarkable it is that some fragrances are composed of substances found hidden deep inside animals that are rarely seen by us. And how much more pleasurable is it that now, no animals need be harmed in the making of this blessing.

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A Long-Forgotten Jewish Remedy for the Coronavirus Outbreak

In the last century there was a particularly Jewish response to a life-threatening epidemic. It was known in Yiddish as the Shvartze Chassaneh, the Black Wedding, and took place in response to the terrible waves of cholera, typhus, and influenza that ravaged the Jews of Eastern Europe, Israel, and North America.

The ceremony was simple: a man and women, each unmarried and either impoverished, orphaned, or disabled (sometimes all three) were married together as husband and wife under a huppah – in a cemetery. The couple’s new home was established with donations by the community. With this act of group hesed, it was hoped that the plague would be averted… 

To read the essay on The Lehrhaus, click here.

The Black Wedding in Apt, 1892. They Called Me Mayer July. Mayer Kirshenblatt. University of California Press.

The Black Wedding in Apt, 1892. They Called Me Mayer July. Mayer Kirshenblatt. University of California Press.

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Berachot 40 ~ “Drink Water and You Will Not be Harmed”

ברכות מ, א

אָמַר רָבָא בַּר שְׁמוּאֵל מִשְּׁמֵיהּ דְּרַבִּי חִיָּיא … וְאַחַר כׇּל שְׁתִיָּיתְךָ שְׁתֵה מַיִם וְאִי אַתָּה נִזּוֹק. תַּנְיָא נָמֵי הָכִי:… שְׁתֵה מַיִם וְאִי אַתָּה נִזּוֹק.

תָּנוּ רַבָּנַן: הַמַּקְפֶּה אֲכִילָתוֹ בְּמַיִם, אֵינוֹ בָּא לִידֵי חוֹלִי מֵעַיִם. וְכַמָּה? אָמַר רַב חִסְדָּא: קִיתוֹן לְפַת

And Rava bar Shmuel said the following advice in the name of Rabbi Chiyya: …after all drinking, drink water and you will not be harmed. That was also taught in a baraita: … drink water and you will not be harmed.

On the topic of health, the Gemara cites that the Sages taught in a baraita: One who inundates his food with water, i.e., one who drinks a great deal of water, will not come to suffer from intestinal illness. The Gemara asks: And how muchwater? Rav Chisda said: One jug [kiton] per loaf.

There are a lot of myths in medicine. You only use 10% of your brain. (Nope). Reading in dim light ruins your eyesight (not even close). And you should drink at least eight glasses of water a day. Also nonsense.

THe origins of the eight cups per day mantra

It is not clear where the modern myth that a person needs to drink eight cups of water each day originated. In a 2002 review of the topic, Heinz Valtin from Dartmouth Medical School suggested that it may have began with “the renowned nutritionist” Fredrick J. Stare, who was an early champion of drinking at least six glasses of water a day. In 1974 Stare wrote this:

How much water each day? This is usually well regulated by various physiological mechanisms, but for the average adult, somewhere around 6 to 8 glasses per 24 hours and this can be in the form of coffee, tea, milk, soft drinks, beer, etc. Fruits and vegetables are also good sources of water.

OK, so a couple of things to note. First, there is no reference for this assumption. It is just asserted, which isn’t the way medical recommendations should be made. Second, Stare wrote that the water need not be drunk from a glass. “Fruits and vegetables are also good sources of water.” Third, there is a huge difference between “somewhere around 6 to 8 glasses” and “at least eight glasses.” And fourth, Stare’s original claim allowed for coffee, tea, soft drinks, and even beer. But proponents of the eight glasses a day mantra do not permit these other beverages as part of their eight cups per day regimen.

In fact the recommendation may go further back that Dr Stare. In 1945 the Food and Nutrition Board of the National Research Council wrote:

A suitable allowance of water for adults is 2.5 liters daily in most instances. An ordinary standard for diverse persons is 1 milliliter for each calorie of food. Most of this quantity is contained in prepared foods.

According to Valtin from Dartmouth, that the last sentence was ignored, “and the recommendation was therefore erroneously interpreted as eight glasses of water to be drunk each day.”

No, You don’t need to Drink eight cups of water each day

So much for the history. What evidence is there to support the claim? Not much. Consider for example, a very large study in the Netherlands in the 1980s and published in the British Journal of Nutrition in 2010. Researchers followed over 120,000 individuals for a period of 10 years, and studied the relationships between fluid intake levels and mortality from heart attack and stroke. They found no link between total fluid intake or water intake and either cause of mortality. They also reported that coffee consumption was inversely associated with mortality from ischemic heart disease in women only, while a higher tea intake was associated with lower mortality in men only. So basically, tea and coffee are sexist.

Fluids don’t do much for your kidney function, and there is no evidence that coffee makes you dehydrated. Also, according to Israeli dermatologists, they don’t do anything for your looks. Sorry.

We have discussed the terrible state of nutrition research before, and noted that for many foods there are conflicting recommendations about whether or not they are good for you. Water is no different, and so it is no surprise to find a study that suggests drinking lots of water is indeed beneficial. In 2002 the American Journal of Epidemiology published the results of the Adventist Health Study, which had followed over 20,000 people since the mid 1970s. Among the findings were that high daily intakes of water (five or more glasses) compared with low (two or fewer glasses) were associated with a decreased risk of heart disease in both men (RR=0.46 95% confidence interval (CI): 0.28, 0.75;) and women, (RR= 0.59 95% CI: 0.36, 0.97). Also, A high fluid intake is associated with a decreased risk of bladder cancer in men. Maybe.

How-to books, beauty journals, the Internet, and the media usually recommend drinking six to eight glasses of water each day for keeping the skin hydrated, helping it look healthier, and making it less prone to wrinkles. We have found no scientific proof for this recommendation; nor is there proof, we must admit, that drinking less water does absolutely no harm. The only certainty about this issue is that, at the end of the day, we still await scientific evidence to validate what we know instinctively to be true—namely, that it is all a myth.
— Ronni Wolf, Danny Wolf, Donald Rudikoff, Lawrence Charles Parish. Nutrition and water: drinking eight glasses of water a day ensures proper skin hydration—myth or reality?. Clinics in Dermatology 2010. 28 (4): 380-383.

Having now studied today’s page of Talmud we are able to add to the important literature on the origins of the eight cups per day myth. It didn’t start in the 1970s or even the 1940s. It began with Rabbi Chiyya in the Babylonian Talmud, and his recommendation to drink a jug of water with every loaf of bread.

הנה ימים באים נאם אדני יהוה והשלחתי רעב בארץ לא רעב ללחם ולא צמא למים כי אם לשמע את דברי יהוה

A time is coming—declares my Lord God—when I will send a famine upon the land: not a hunger for bread or a thirst for water, but for hearing the words of the Lord.
— Amos 8:11

Next time, on Talmudology: the Musk Deer and Sperm Whales

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Tu Bishvat ~ The Roots of a Palm Tree

According to the Hebrew calendar, today is the fifteenth day of Shevat, and is celebrated as the New Year for Trees. In honor of this we present a re-post about the roots of the Date Palm tree.

בבא בתרא כז ,ב

אמר עולא אילן הסמוך למצר בתוך שש עשרה אמה גזלן הוא ואין מביאין ממנו בכורים עשרה אמה... ותו לא והא תנן מרחיקין את האילן מן הבור כ"ה אמה אמר אביי מיזל טובא אזלי אכחושי לא מכחשי אלא עד שש עשרה אמה טפי לא מכחשי

Ulla said: An individual who owns a tree that is within sixteen cubits of a boundary is a robber, [since it draws nourishment from the neighbor’s land,] and one does not bring first fruits from it, [since that would be a mitzva that is fulfilled by means of a transgression]... But do roots extend sixteen cubits and no more? Didn’t we learn in a Mishnah (25b): One must distance a tree twenty-five cubits from a cistern? [This indicates that tree roots reach more than sixteen cubits.] Abaye said: The roots extend farther, but they drain the earth of nutrients within sixteen cubits; with regard to an area any more distant than that, they do not drain the earth.

The Root Systems of the Date Palm Tree

While the Talmud doesn't specify the kind of tree that must be distanced from others, in Mesepotamia the most likely candidate was the Date PalmPhoenix dactylifera. These trees grow to a height of 75 feet, and you've seen plenty of them if you've driven south towards Eilat.  Here is their root system:

USDA image from Chao. C, Krueger R. The Date Palm (Phoenix dactylifera L.): Overview of Biology, Uses, and Cultivation. Hort. Science 2007 42(5); 1077-1082.

USDA image from Chao. C, Krueger R. The Date Palm (Phoenix dactylifera L.): Overview of Biology, Uses, and Cultivation. Hort. Science 2007 42(5); 1077-1082.

To whom shall we turn to get information about the size of that root system? The United Nations Food and Agriculture Organization, of course.  According to a helpful document by a member of their Date Production Support Programme, "Roots are found as far as 25m from the palm and deeper than 6m, but 85 percent of the roots are distributed in the zone of 2 m deep and 2m on both lateral sides in a deep loamy soil." But the 25m (82 foot) roots are an extreme. Most of the roots extend about 10m (about 32 feet).

Table from here.

Table from here.

It would appear that Abaye was referring to the average reach of the zone II roots. Assuming that a talmudic amah is between 48-57cm, Abaye's figure would put the zone II distance of at 7.6-9.1 m. That's right in keeping with the 10m average figure from the UN document. It is good to know that on these important matters, the UN and the Jewish People are in agreement.

Image from here.

Image from here.

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