In the same year (1870) he brought out the first edition of his "Modern Therapeutics," a technical work, addressed to physicians. This was enlarged in successive editions, until in its present form, as continued by other hands in its latest editions, it comprises two parts of 600 pages each. Although the author claimed little other originality in this work than the selection and arrangement of known facts, yet in these respects he displayed the strongly practical and original turn of his mind. As a student of the art of Therapeutics in large hospitals, clinics, and dispensaries, he had convinced himself that it is not by experiments on lower animals, nor yet on the human body in health, that the physician can attain the glorious power of alleviating pain and curing disease; it is only through the daily combat with sickness, by the bedside and in the consulting room. Chemistry and physiology, he believed, could teach but little in this branch; observation and experience everything. Hence, in his work on Therapeutics he announced himself as "aiming at a systematic analysis of all current and approved means of combating disease," selecting his formulæ and therapeutical directions from the most eminent living physicians of all nations. This work was most favorably received by medical men; and, edited and revised by competent hands, continues to be regarded as one of the most valuable works in American medical literature. The unanimous opinion of the leading medical journals, as well as of its numerous purchasers, have testified to its real and great worth to the practitioner of medicine. Having thus established a wide, popular and professional reputation, one which would have guaranteed him a lucrative practice, it would have tempted another, no doubt, to make the most of this opportunity, so rarely granted a young physician. Not so was it with Dr. Napheys. No sooner had the three works mentioned been completed than he sailed for Europe, in order to familiarize himself with the famed schools of learning of the Old World and its rich stores of material for culture. The summer was that of the Franco-German war; and spending most of it in Paris, he was witness of several of the most exciting scenes which attended the dethronement of the Emperor. These he would describe afterwards with a vividness and power of language rarely excelled.