156 



GASEOUS METABOLISM OF INFANTS. 



COMPARISON OF THE AGE AND HEAT-PRODUCTION PER KILOGRAM 



OF BODY-WEIGHT. 



Since an inspection of the data contained in table 31 appeared to 

 show that the younger infants produced the least heat per 24 hours, 

 it seemed desirable to study the influence of age upon the metabolism. 

 A chart was prepared in which the heat per kilogram per 24 hours is 

 compared with the age at the time of observation, this comparison 

 being given in figure 59. Here again no correlation is indicated between 

 the two factors, infants 4| months of age showing a heat-production 

 per kilogram of body-weight ranging from 55 to 85 calories per kilo- 

 gram per 24 hours. 



HEAT PER KILOGRAM OF BODY-WEIGHT PER 24 HOURS 



JL 



EF 



EG 



MM 



AS 



MD 



MC DQ 

 *LRB 



EK 



MA 



RL 



PW 



AC 



PS 



FK 



E*N 



RE LB 



. KR 



EHS 



ER 



GS 



DM 



JP 



_. . JS 



JB WP 

 AD 

 AL 



FB 



ES 



EL 



JM 



LO 



JV 



FM 



jy 



45 



50 



55 



60 



65 



70 



75 



60 



65 



90 



Fig. 59. Chart showing the age of infants and heat-production per kilogram of body- 

 weight per 24 hours. 



From these data, therefore, it would appear that neither the weight 

 nor the age shows a uniform relation to the total heat-production or 

 to the heat-production per kilogram of body-weight. In this finding 

 we are completely in accord with all other experimenters in metabolism, 

 since the lack of relationship between body-weight and metabolism 

 is invariably noted. This is particularly the case when two living 

 bodies are compared which vary considerably in weight. 



With men, it is true, the metabolism per kilogram of body-weight 

 is considered and commonly used as a reasonably accurate base-line 

 for comparative purposes. Nevertheless the relationship is invariably 

 disturbed when one of the individuals is very fat and the other under- 



