114 



THE NEXT GENERATION 



the whale or the elephant, and no less than two cells for either 



the mouse or the mosquito. 



In this connection remember that never in the life of any 



animal do cells multiply so fast as before the creature is born. 



And this applies equally well to viviparous and to oviparous 



animals. But after 

 birth, what a differ- 



f . {^,- ^ ence ! Compare, for 



I jrifer-'-y ^ t * example, the chick 



&if' and the rabbit. The 



former is spry from 

 the start. He has 

 keen, round eyes. He 

 spies food at once, 

 seizes it, feeds him- 

 self, and scurries 

 about on sturdy little 

 legs, apparently hav- 

 ing a mind of his 

 own from the first. 

 Fluffy down covers 



A 



D 



FOUR TADPOLES OF THE EUROPEAN FROG 

 (RANA FUSCA) 



The four animals are all of the same age (three days). 



They were raised from the same batch of eggs but 



have been kept at different temperatures. (After 



Oskar Hertwig) 



his body, and in sum- 

 mer, when chicks are 

 young, the warmth of 

 a sheltering mother 

 often seems alto- 

 gether superfluous. 

 It is otherwise with the viviparous small rabbit. He 

 arrives in the world blind, almost naked of hair, unable to 

 move in this direction or that, unable to hunt for food, able 

 indeed to do nothing more than take food from his mother 

 according as he needs it. 



