Clemens Alexandrinus has transmitted to us (Stromat. lib. 6,) a curious detail of the forty-two volumes which were borne in the procession of Isis. "The priest," says he, "or chanter, carries one of the symbolic instruments of music, and two of the books of Mercury; one containing hymns of the gods, the other the list of kings. Next to him the horoscope (the regulator of time,) carries a palm and a dial, symbols of astrology; he must know by heart the four books of Mercury which treat of astrology: the first on the order of the planets, the second on the risings of the sun and moon, and the two last on the rising and aspect of the stars. Then comes the sacred author, with feathers on his head (like Kneph) and a book in his hand, together with ink, and a reed to write with, (as is still the practice among the Arabs). He must be versed in hieroglyphics, must understand the description of the universe, the course of the sun, moon, stars, and planets, be acquainted with the division of Egypt into thirty-six nomes, with the course of the Nile, with instruments, measures, sacred ornaments, and sacred places. Next comes the stole bearer, who carries the cubit of justice, or measure of the Nile, and a cup for the libations; he bears also in the procession ten volumes on the subject of sacrifices, hymns, prayers, offerings, ceremonies, festivals. Lastly arrives the prophet, bearing in his bosom a pitcher, so as to be exposed to view; he is followed by persons carrying bread (as at the marriage of Cana.) This prophet, as president of the mysteries, learns ten other sacred volumes, which treat of the laws, the gods, and the discipline of the priests. Now there are in all forty-two volumes, thirty-six of which are studied and got by heart by these personages, and the remaining six are set apart to be consulted by the pastophores; they treat of medicine, the construction of the human body (anatomy), diseases, remedies, instruments, etc., etc."