268 CARNEGIE INSTITUTION OF WASHINGTON. 



wdth successive trials. A group of 20 adults, mostly women, were 

 given a practice series of 20 trials a day for 35 days. The data, most 

 of which were collected by Mr. E. S. Mills, will be prepared for publi- 

 cation at an early date. 



Preliminary experiments with pursuit-meter apparatus. — Dr. Miles's 

 pursuit-meter apparatus has unique advantages in measuring ability 

 for accurate continuous work. Immediately at the end of a test 

 period, one may read directly from the meters the integrated score for 

 the duration and magnitude of errors made by the subject. The score 

 for a test period of 5 minutes has been found in preliminary experi- 

 ments to range from 4,000 to 400 meter units, according to the age, 

 intelligence, and practice of the individual used in the experiment. 

 The task is found to be so simple that a child 5 years old can do it with 

 some degree of proficiency, while there is sufficient latitude for the 

 efforts of the keenest adult. A large number of trials have been made 

 on a few subjects to determine the best lighting conditions, to obtain 

 practice curves, and to improve the experimental routine. 



Metabolism during muscular work. — Although no experimental work 

 was done last year on metabolism during muscular work, the results 

 of the earlier extensive study on metabolism during walking, carried 

 out by Dr. H. M. Smith, is in an advanced state of preparation for 

 publication. Plans have been made for direct calorimetric measure- 

 ment of the metabolism during severe muscular activity by means of a 

 specially constructed calorimeter. In anticipation of increased need 

 of space for these studies, two of the older respiration calorimeters 

 have been demolished to provide space for more modern apparatus. 



Metabolism of normal children. — Studies on the basal metabolism of 

 normal children from 2 years of age to puberty have been continued in 

 cooperation with Dr. Fritz B. Talbot, at the New England Home for 

 Little Wanderers, and with the assistance of Miss Inza A. Boles and 

 Mrs. Dorothy A. Peabody. The studies were concluded on July 1, 

 1919, as sufficient material had been accumulated to give a reasonably 

 complete picture of the metabolism of children from birth to puberty. 

 A report of the later studies, with a general survey of the whole field 

 covered by the series of investigations, is being prepared for publi- 

 cation. A summary of the findings in the research on this subject was 

 presented by the Director as the Shattuck lecture at the meeting of the 

 Massachusetts Medical Society in June 1919. 



Studies of metabolism with varying environmental temperatures. — The 

 studies on the efTect of varying environmental temperatures upon the 

 metabolism have been extended this year, the subject being the same 

 artist's model used in last year's experimenting. The stimulating 

 effect of various foods was a feature of the series of observations under 

 these conditions. The clinical respiration chamber was used for the 

 measurements of the respiratory metabolism. Near the conclusion of 



