738 



THE RESPIRATION AND 



[pT. m 



The general impression left by the work of Sandiford & Wheeler 

 and of the other investigators mentioned is that the metabolic rate 

 of the human embryo does not change much during pre-natal life. 



3*30- 



3.00- 



2.70 



2'40- 



2»10 



1.80 



Calories 



= Magnus -Levy 



= Benedict and Collaborators 



= Murlin 5? »? 



= Palmer -Means -Gamble 



= Sage Institute 



L ! \ 



10 Years 15 



Fig. 165. 



20 



28 



But it must be remembered that they could not take account of the 

 embryo until the 4th month, owing to its minute weight compared 

 to that of the mother. On the whole, however, the measurements of 

 heat-production during pregnancy are very difficult to interpret from 

 the point of view of the present discussion. 



