ii8 POPULAR SCIENCE MONTHLY. 



of June lie started again for Germany, where lie spent tlie summer 

 months in the Heidelberg laboratory with Kliline, returning to New 

 Haven in the fall in time to take up his routine work at the opening 

 of the college year. This was the beginning of a series of investiga- 

 tions undertaken jointly with Kiihne and carried on for many years 

 by correspondence, which resulted in a long list of contributions bear- 

 ing on the chemico-physiological problems of gastric and pancreatic 

 digestion, published mainly in the Zeitschrift filr Biologie, in 

 Munich. The facts thus acquired threw great light upon many of 

 the darker problems of gastric and pancreatic proteolysis, and consti- 

 tute at present the basis of our physiological knowledge concerning 

 the changes which proteid foods undergo in digestion. During 

 these years Professor Chittenden's activity was very great. Besides 

 enlarging and modifying his course of instruction to the students of 

 biology, and attracting graduate students to his laboratory, independ- 

 ent research work was continually carried on, with the result that in 

 the years 1883 to 1888 three volumes of Studies from the Laboratory 

 of Physiological Chemistry, of from one hundred and sixty to two 

 hundred pages each, were published, containing the results of his in- 

 vestigations carried on by the help of the graduate students and assist- 

 ants he had collected about him. The value of these researches may 

 be inferred from the constant reference made to them in all standard 

 text-books on physiological chemistry. 



In 1890 Professor Chittenden became one of the associate editors 

 of the English Journal of Physiology, edited by Michael Poster, and 

 for several years thereafter the researches from the laboratory ap- 

 peared regularly in this journal. In 1885 to 188Y he wrote a num- 

 ber of articles on physiological topics for the Reference Handbook of 

 the Medical Sciences. In 1890 he was elected a member of the 

 JSTational Academy of Sciences. In the revision of Webster's Inter- 

 national Dictionary he was charged with the editing of the defini- 

 tions in general biology, physiology, and physiological chemistry. 

 In 1894 he delivered the Cartwright Lectures before the Alumni 

 Association of the College of Physicians and Surgeons of 'New York, 

 the subject being Digestive Proteolysis. These lectures were pub- 

 lished in book form in 1895. When the Journal of Experimental 

 Medicine was started, in 1896, he became one of the associate editors 

 for physiology. 



He has been on the council of the American Physiological 

 Society ever since its foundation in 1887, and has been president of 

 the society since 1895. He was president of the American Society 

 of ^Naturalists for 1893. He has read various papers before the N"ew 

 York Academy of Medicine. He was active in the establishment of 

 the American Journal of Physiology — the first number of which ap- 



