382 



ON INCREASE IN SIZE 



[PT. Ill 



into account, the growth-rate for the first month was 574,999 per 

 cent. What meaning can be attached to the enormous growth-rate 

 figures which always appear when the Minot method is used for very 

 young embryos must later be discussed. 



Fig. 32, which collects together the data of many observers, shows 

 a considerable measure of unanimity between them. Ahlfeld's 

 figures are the only ones which show serious divergence, and they 

 were not taken into account by Jackson in his preparation of the 

 "normal curve". Fig. 32 shows also by points the volume of the 

 embryo at the different stages, but it does not differ much in value 

 from the weight in grams. The specific gravity of the foetus does not, 

 according to Jackson, remain precisely the same throughout develop- 



