i82 REPORTS ON inve;stigations and projects. 



calorimeters and accessory apparatus, it was considered advisable to increase 

 the facilities of the laboratory by constructing a gallery upon which appa- 

 ratus could be stored and which would also provide desk-room for assistants 

 in connection with the work. Accordingly such a gallery, with stairway, has 

 been built in the southwest corner of the laboratory, and an assistant perma- 

 nently stationed there, who makes the calculations for each experiment as 

 soon as the results are available. It has been found a very great advantage 

 to have the work done in the calorimeter laboratory. A part of the space 

 has also been utilized for storing apparatus, printed forms, etc., which are to 

 be used in the laboratory, and which are thus immediately available when 

 needed and out of the way at other times. 



SPECIAL APPARATUS AND MACHINERY. 



In a recent European trip several pieces of apparatus were ordered for the 

 use of the laboratory. Among these were a Deprez-d'Arsonval galvanometer 

 and a Sonden-Pettersson gas-analysis apparatus. Three Brunswick calculat- 

 ing machines were also purchased for use in calculations. For the purpose 

 of still further increasing the efficiency of the machine-shop, a precision lathe 

 has been added to its equipment. During the past year there has been added 

 to the office equipment a phonograph for dictation, and much use has been 

 made of it, especially in preparing rough drafts of material intended for 

 publication. 



COOPERATING AND VISITING INVESTIGATORS. 



Dr. Elliott p. Joslin has continued his cooperation in the study of metabo- 

 lism in diabetes and has offered many helpful suggestions in connection with 

 the work. He has also had entire care of the patients, and it is almost 

 entirely due to his enthusiastic assistance that the laboratory has been able 

 to carry out this work. 



Dr. John Homans, of the Harvard Medical School, has likewise cooperated 

 in the investigations upon the influence of the removal of the hypophysis 

 from small animals. 



A number of foreign investigators have visited the Nutrition Laboratory 

 during the past year, their visits varying in length from several days to two 

 or three weeks. Among them was Prof. Otto Cohnheim, of Heidelberg, 

 who spent two or three weeks at the laboratory and served as the subject of 

 several experiments with the respiration apparatus and the respiration calo- 

 rimeter. He also made a critical study of the respiration apparatus for men 

 with the idea of applying the same principles to the study of the gaseous 

 metabolism of extirpated organs. Dr. M. Hindhede, of Copenhagen, Den- 

 mark, spent about three weeks at the laboratory during the early part of the 

 spring, and was the subject of several experiments in the respiration calo- 

 rimeter dealing with the influence of food upon metabolism. Prof. Adolph 

 Magnus-Levy, of Berlin, spent two or three days at the laboratory, and made 

 a short study of the methods employed in the investigations on metabolism 



