This doctrine had been proclaimed for about a century during the period of which we now speak, but later led men into a fondness for secondary generalities or for the elevation and magnifying of trifles, which confused their minds and terminated its usefulness to science. Meanwhile, a man of great intelligence, renowned as an elocutionist, well{044} versed in the doctrine of philosophers and grammarians--namely, _Asclepiades_, of Bythinia--came to Rome with the intention of teaching rhetoric. By his talent and personal address he soon became one of the most illustrious persons in the Roman Republic; so early as 150 B.C. he enjoyed a high reputation as a rhetorician, and was one of the intimate friends of Cicero; nevertheless, he abandoned letters, undertook the practice of medicine, and sought moreover to create a new system, being unwilling to follow in the track of his predecessors. Imbued with the philosophy of Epicurus, who was then in high repute, he deduced from it a theory which was in harmony with the philosophy of the day. He thought that the elements of the body existed from eternity; that they were indivisible, impalpable, and perceptible to the reason only. These elements he named _atoms_, which were supposed to be animated by perpetual motion, and from which, by their frequent encounters and fortuitous contention, all sensible phenomena were supposed to result. He explained the properties of the body by saying that compounds were aggregates of atoms, differing very much from atoms themselves. Solid silver, he said, is white, but, reduced to powder, appears black; the horn of the goat, on the contrary, is black, but if it be razed its particles are white. This, it will be seen, was the parent of our present atomic theory. He ridiculed the theories of Hippocrates concerning coction, crises, etc., and sarcastically called the Hippocratic treatise on therapeutics "a meditation on death." Asclepiades based his own therapeutics on endeavors so to enlarge the pores of the human body that disease could find egress, or so to constrict them that it could not enter; consequently he rejected all violent remedies, such as vomits, purges, etc., and his favorite remedies were hygienic,--for the most part bodily exercise.