220 CARNEGIE INSTITUTION OF WASHINGTON. 



ADDITIONS TO EQUIPMENT. 



Respiration chamber for treadmill observations. — To study the energy- 

 required for the work of forward progression, as in walking at a 

 moderate pace, the treadmill extensively used in previous researches 

 was employed in the research on low diet and a special form of respi- 

 ration chamber was constructed to fit over the treadmill. The entire 

 apparatus, with accessory features, is described in the report of the 

 low-diet investigation. This respiration chamber has given excellent 

 results and will ultimately be used for preliminary studies in connec- 

 tion with researches on the effects of more rapid walking. 



Reconstruction of the calorimeter for small animals and infants. — The 

 respiration chamber for small animals and infants, which has been 

 in successful use for two years, is now being reconstructed in a more 

 substantial form, with important modifications and betterments. 

 When the reconstruction is completed and the apparatus fully tested, 

 it will be used for direct calorimetric measurements with small animals 

 and infants. 



Recorder for adequacy of motor adjustments. — In our psychological 

 laboratory we have given a great deal of prominence to the time rela- 

 tions of reactions and motor coordinations. No satisfactory means 

 has been at hand for taking account simultaneously of the adequacy 

 or accuracy of these processes. The apparatus which Dr. Miles has 

 under construction could not be completed early enough to serve in 

 the study of undernutrition, but will doubtless be of great usefulness 

 in future investigations. The subject views the scale of a wattmeter 

 and is required to keep the indicator at zero. A disturbing element 

 produces an unknown and unpredictable series of fluctuations in the 

 wattmeter which the subject must compensate, while the duration and 

 extent of his plus and minus errors are integrated by two other meters, 

 and a curve-drawing instrument provides a graphic record of his per- 

 formance. 



COOPERATING AND VISITING INVESTIGATORS. 



Owing to the fact that Dr. Elliott P. Joslin entered the National 

 service as major in the Medical Corps and was subsequently assigned 

 to a hospital in France, the research on diabetes which, in previous 

 years, has been carried out with his cooperation was discontinued. 

 The equipment which had been installed for this work in the special 

 laboratory at the New England Deaconess Hospital was removed 

 and has been actively employed in other researches. Immediately 

 prior to his embarkation for field service in France, Dr. Joslin pub- 

 lished a "Diabetic Manual." This manual embodies the results of his 

 extended experience with diabetics and a system for treatment 

 which has been based in part upon the experimental data accumu- 

 lated in connection with the Nutrition Laboratory. 



