Divination by the day of the moon.
A commoner method of divination and one more nearly approaching approved astrological doctrine was that by the day of the month or moon. Briefest of such moon-books is that which merely designates each of the thirty days as favorable or unfavorable.[2745] We also find a Lunarium for the sick, stating the patient’s prospects from the day of the moon on which he contracted his illness;[2746] a work ascribed to “Saint Daniel” on nativities by the day of the moon;[2747] and an equally brief interpretation of dreams upon the same basis.[2748] Or all these matters may be considered in the same treatise and each of them somewhat more fully, and we may be told whether the day is a good one on which to buy and sell, to board a ship, to enter a city, to operate upon a patient, to send children off to school, to breed animals, to build an aqueduct or mill, or whether it is best to abstain on it from most business. Also such predictions as that the boy born on that day will be illustrious, astute, wise, and lettered; that he will encounter danger on the water, but will live to old age if he escapes; while the girl born on the same day will be “chaste, benign, good-looking, and pleasing to men.” That anyone who takes to his bed on that day will suffer a long sickness, but that it is a favorable day for blood-letting, and that one should not worry about dreams he has then, since they possess no significance either for good or evil. Also what chance there is of recovering articles stolen on that day.[2749] In later manuscripts at least it is further stated that certain Biblical characters were born on this day or that day of the moon: Adam on the first, Eve on the second, Cain on the third, Abel on the fourth, and so on.[2750]
Authorship of moon-books.
In the early manuscripts moon-books are anonymous or ascribed to Daniel, but in later medieval manuscripts other authors are named. The name of Adam is coupled with that of Daniel in both of two rather elaborate moon-books in a fourteenth century manuscript,[2751] where Adam is said to have worked out these “lunations” “by true experience.” A fifteenth century one is attributed to a philosopher, astrologer, and physician named Edris,[2752] perhaps the Esdras of the method of divination by the kalends of January rather than the Arab Edrisi. It briefly predicts from the relation of the moon to the twelve signs whether patients will recover and captives escape. In a sixteenth century manuscript at Paris are “Significations of the days of the moon which the most excellent astronomer Bezogar revealed to his disciples and transmitted to them as a very great secret and most precious gift.”[2753] But such an ascription is rather obviously a late fiction.
Spheres of life and death: in Greek.
Determining the fate of the patient from the day of the moon upon which his illness was incurred enters also into certain spheres of life and death which were much employed in the early middle ages. But in these the number of the day of the moon is combined with a second number obtained by a numerical evaluation of the letters forming the patient’s name. This method came down from the ancient Greek-speaking world, as in a “Sphere of Democritus, prognostic of life and death” found in a Leyden papyrus,[2754] while the very similar Sphere of Petosiris, the mythical Egyptian astrologer, is variously dated by W. Kroll from the second century before Christ, by E. Riess from the first century before Christ, and by F. Boll in the first century of our era.[2755] The so-called “Sphere” is really only a wheel of fortune, circle, or other plane figure divided into compartments where different numbers are grouped under such headings as “Life” and “Death.” Having calculated the value of a person’s name by adding together the Greek numerals represented by its component letters, and having further added in the day of the moon, one divides the sum by some given divisor and looks for the quotient in the compartments. This method of divination was also employed in regard to fugitive slaves and the outcome of gladiatorial combats.[2756]
Medieval Latin versions.
In the medieval Latin versions of these Spheres of life and death the numerical value of the Greek letters was naturally usually lost and arbitrary numerical equivalents were assigned to the Roman letters or some other method of calculation was substituted. The Sphere of Petosiris was perpetuated in the form of a letter by him to Nechepso, king of Egypt.[2757] But more common than this in manuscripts of the ninth, tenth, and eleventh centuries was the Sphere of life and death of Apuleius or Pythagoras or both[2758] which replaced that of Democritus. Like it, it consisted of the numbers from one to thirty arranged in six compartments, three above a line each containing six numbers, and three below the line having four each. John of Salisbury, in the twelfth century, presumably refers to it when he speaks of divination or lot-casting “by inspection of the so-called Pythagorean table”;[2759] and it continues to be found with great frequency in the manuscripts of subsequent centuries.[2760] It is not to be confused, however, with the Prenostica Pitagorice, a more elaborate, although somewhat similar, method of divination by means of geomantic tables, of which we shall treat later in the chapter on Bernard Silvester. A Sphere ascribed to St. Donatus in a twelfth century manuscript includes instructions how to determine the sign of the zodiac under which a person was born by computing the difference between his name and his mother’s name. If this amounts to four letters, he was born under the fourth sign, and so on.[2761]
Survival of such methods in medical practice of about 1400.
The survival of such superstitious methods of divination into the later middle ages is attested not only by the frequent recurrence of the Sphere of Apuleius and the divinations from the kalends of January in manuscripts of the later centuries, but by the medical notebook, written in middle English, of John Crophill, who practiced medicine in Suffolk under Henry IV.[2762] Besides a record of his patients and the sums of money due from them, rules of dieting and blood-letting for the twelve months of the year, and his “more regular and masterly observations upon Urin,” his notes include a treatise on astrological medicine which, in the sarcastic language of the old catalogue of the Harleian Manuscripts, concludes “with a masterpiece of art, namely, a tretys or chapter of ‘Calculation to know what thou wilt,’ and this by observation of persons’ names.” The notebook also contains “Oracular Answers prepared beforehand by this great Doctor for those of both Sexes who shall come to consult him in the momentous affair of Matrimony; according to the several Months of the year wherein they should apply themselves.” Further contents are an incantation in Latin for women in child-birth, and “The names of the 12 signs with such marks as shew that this John Crophill was a dabbler in Geomancy.”