244 CARNEGIE INSTITUTION OF WASHINGTON. 



The laboratory equipment for the intimate study of the various 

 chemical and physical factors entering into muscular work has been 

 supplemented by the purchase of the new form of electrical ergom- 

 eter devised by Dr. A. Krogh, of Copenhagen. 



For the researches into the mechanics of respiration,, which have 

 lieen carried out by Mr. Carpenter, a 100-liter spirometer of the 

 Tissot type with a recording apparatus has been secured. Among 

 other minor apparatus may be mentioned a Kronecker inductorium 

 and a cinematograph apparatus for studying by films the move- 

 ments of men during muscular activity of various kinds. 



For our clerical division two more dictaphones have been obtained 

 and a specially constructed adding machine which enables rapid 

 calculations, correct addition, and direct tabulation of results. 



8ets of scientific journals used by the masters of physiology in 

 publishing the results of their important researches have been pur- 

 chased from time to time for our library. With the increasing 

 number of regular and volunteer workers in the laboratory, the 

 demands upon the library are becoming more and more evident each 

 year. It is therefore desirable to have an equipment of the standard 

 scientific journals, which will necessitate considerable additions in 

 the near future. 



COOPERATING AND VISITING INVESTIGATORS. 



In the fall of 1912 an unusually large number of physiologists and 

 physicians from Europe came to America, and a number of these 

 visited the Nutrition Laboratory, inspected its equipment very 

 carefully, and offered many interesting and valuable suggestions. 

 Professor Gabriel Bertrand was commissioned by the Societe Scien- 

 tifique d'Hygiene Alimentaire of Paris to investigate the respiration 

 calorimeters with a view to constructing such an apparatus in the 

 new laboratory of the society in Paris. Special mention should be 

 made of the visits of Professors Franz Tangl of Budapest, Karl von 

 Noorden of Frankfort, and Max Rubner and W. His of Berlin. 



Dr. E. P. Joshn has continued his cooperation in the study of 

 diabetes mellitus. Dr. Fritz B. Talbot has been actively prosecut- 

 ing a series of researches on the metabolism of infants in the children's 

 ward of the Massachusetts General Hospital. Dr. Joseph H. Pratt 

 completed the series of observations on meat feeding of dogs with 

 atrophied pancreas, using the new respiration apparatus whereby 

 oxygen determinations were secured. 



Professor Raymond Dodge, of the department of psychology of 

 Wesleyan University, spent the week-ends at the laboratory for 

 the first half of the academic year of 1912-13, installing the appa- 

 ratus in the psychological laboratory and making preparations for 



