APPARATUS AND EXPERIMENTAL TECHNIQUE. 31 



the age when it was most necessary to introduce into the metabolism 

 measurements the stimulating factor of a small amount of food, we 

 have the compensatory depressing influence of sleep. It is probable 

 that these to a certain extent neutralize each other. At present, 

 one may not exactly calculate the influence of sleep on the various 

 children studied. Certainly, the ingestion of food on the one hand and 

 the greater prevalence of sleep on the other tend towards a compensa- 

 tion which makes the measurements of the metabolism of the younger 

 children more nearly comparable with those made with the older 

 subjects, who were in many instances awake. 



