NUTRITION LABORATORY, 297 



Minor apparatus. — The static control recorder of Dr. Miles, briefly 

 described in the annual report for 1920, has been duplicated. 



Extensive experience with the new portable respiration apparatus 

 devised in conjunction with Air. Warren E. Collins, former mechani- 

 cian of the Laboratory, has shown during the past winter the most 

 advantageous use of a kj^mograph for writing the character of the 

 respirations. Likewise a simple though extraordinarily efficient 

 method has been developed for testing for a leak — an ever-present 

 possibility in the use of all respiration apparatus. 



A simple, home-made respiration apparatus was devised and ex- 

 hibited at the Harvard jMedical School. 



COOPERATING AND VISITING INVESTIGATORS. 



Dr. Elliott P. Joslin, with a number of his personal assistants and 

 members of the Laboratory editorial and computing staff, is preparing 

 a final report on diabetic metabolism with varjdng diets. 



Dr. Howard F. Root, associated with Dr. Joslin, has actively co- 

 operated with Dr. Miles in certain physiological and psychological 

 tests on diabetic patients, as well as in taking blood samples for several 

 subjects used in the research on the effect of alcoholic beverages. 



Dr. Paul Roth, at the Battle Creek Sanitarium, Battle Creek, Michi- 

 gan, has continued his tests of the new portable respiration apparatus 

 and has contributed one or more medical papers on this subject. 



Dr. H. Takahira, of the new Nutrition Institute of Japan, in Tokyo, 

 made a visit of several weeks to the Laboratory for the study of the 

 clinical chamber apparatus devised in the Laboratory and constructed 

 by Mr. Collins. The study was made in anticipation of the instal- 

 lation of this apparatus in the Japan institute. 



Professor E. G. Ritzman has continued the studies on the energy 

 requirements of large animals with the new respiration apparatus in 

 the Agricultural Experiment Station at Durham, New Hampshire. 

 Frequent conferences with Professor Ritzman and Director John C. 

 Kendall have resulted in the most active continuation of experimental 

 work in this field. 



Dr. C. G. Abbot, Assistant Secretary of the Smithsonian Institution, 

 Washington, D. C, became much interested in studying the problem 

 of radiation from the nude human body, and spent a week at the 

 Laboratory with a honeycomb pyranometer, making a series of 

 observations. 



Among numerous foreign visitors, especial mention should be made 

 of the stimulating conferences with Professor F. Gowland Hopkins, 

 of Cambridge, England, Dr. G. von Wendt, of Helsingfors, and Pro- 

 fessor T. Thunberg, of Lund. 



