442 



ON INCREASE IN SIZE 



[PT. 



Ill 



hausen's general results, however, were as follows: on the 5th and 

 6th days, the growth-rate of all organs is falling, with the possible 

 exception of liver and hind limb. This continues till the beginning 

 of the 7th day, save that the eye and the lens may show a slight rise. 

 At the beginning of the 7th day, however, the growth-rates of all 

 organs rise, firstly the mesonephros, the liver and the lung, and, to a 



^17 



S. 16 



x5 10 



1.4 



o^l3 



o\i2 

 <n 



clO 



^ 9 

 c 

 m 8 



2 7 



(0 5 



X3 





E (E) = Fore limb 



G = Gonad 

 M = Mesonephros 



Abs. web 

 wei ghb 



12 3 4 5 6? 



9 10 11 12 13 14 15 16 17 18 19 20 

 Days 



Fig. 56. 



less extent, the hind limbs, then these are followed by the rest. After 

 a peak all fall until the 1 1 th day, when all again rise, only to fall 

 on the 14th, with the exception of the feathers, which maintain a rise. 

 Later a more gradual rise in growth-rate takes place throughout the 

 body, begun by the lens and liver and, to a less degree, by the eye 

 and the brain, and continued by the stomach and the mesonephros. 

 After the subsequent fall, only small variations take place, which are 

 found to be synchronous for groups of organs such as kidney-liver- 



