Progeny 67 



scarcely a vestige of katabolism, all going to build 

 up the rapidly growing creature. 



"With regard to air, however, the fresh supply 

 is taken up by the root, from the same source as the 

 food, and as it is used up it nmst be returned, con- 

 sequently the katabolism which takes place in foetal 

 cell life is gauged by the return of COj. This is 

 the metabolism which goes on in the foetus. Xow 

 let us take the metabolism in the pregnant female. 

 She has naturally the same duties to perform as she 

 had as regards herself when she was non-pregnant, 

 and in addition she has to convey away through her 

 blood to her lungs the CO2 of the foetus. What 

 debris, too, of cell life from the foetus that is passed 

 to her blood, she would naturally excrete by her 

 kidneys. Consequently the whole difference as far 

 as metabolism is concerned in the pregnant female 

 is that she has to submit to doing double duty, i.e., 

 allow her foetus to absorb its food from her, and 

 convey away what it rejects. 



"Xow as this is the metabolism which goes on in 

 the non-pregnant female, in the foetus, and the 

 pregnant female, I would ask Dr. !Mills to say what 

 the exact metabolic change is that occurs in the 

 female, and what it is that she receives from the 

 foetus that causes this change. Dr. INIills does not 

 intend us to believe, so I understand his views, that 



