fine-spun theories of the scientist that took so long to elaborate have been placed definitely in the lumber room. His reputation as a writer on medical topics is not as great as that which has been accorded him for his writings on philosophy and in Talmudic literature, but he well deserves a place among the great practical masters of medicine, as well as high rank among the physicians of his time. There is little that is original in his writing, but his thoroughgoing common sense, his wide knowledge, and his discriminating, eclectic faculty make his writings of special value. As might have been expected, the Aphorisms of Hippocrates attracted his attention, and, besides, he wrote a series of aphorisms of his own. The most interesting of his writings, however, is a series of letters on dietetics written for the son of his patron Saladin. The young prince seems to have suffered from one of the neurotic conditions that so often develop in those who have their lives all planned for them, and little incentive to do things for themselves. The main portion of his complaints centred, as in the case of many another individual of leisure, in disturbances of digestion. Besides, he suffered from constipation and feelings of depression. Doubtless, like many a young person of the modern time, he was quite sure that these symptoms portended some insidious organic ailment that would surely bring an early death. When fathers, having done all that there is to do, just expect their sons to enjoy the fruits of the paternal accomplishments, conditions of this kind very often develop, unless the young man proceeds to occupy himself with even more dangerous distractions than he finds in unending thought about his own feelings. The rules of life and health that Maimonides laid down in these letters have become part of our popular medical tradition. Probably more of the ordinarily current maxims as to health have been derived from them than would possibly be suspected by anyone not familiar with them. In various forms his rules have been published a number of times. A good idea of them can be obtained from the following compendium of them, which I abbreviate from a biographical sketch of Maimonides by Dr. Oppler, which appeared in the "Deutsches Archiv fuer Geschichte der Medizin und Medicinische Geographie" (Bd. 2, Leipzig, 1879). 1. Man is bound to lead a life pleasing to God if he wants to have a healthy body, and he must hold himself far from everything that can hurt his health and accustom himself to whatever renews his strength. He should eat and drink only when hungry and thirsty and should be particularly careful of the regular evacuation of his bowels and of his bladder. He must not delay either of these operations, but as far as possible satisfy the inclination at once.