3IO 



The Study of Animal Life 



cogent. In another part of this book I have given examples 

 of the state of hfelessness which drought induces in some 



Fig. 64. — Axolotl (iu the water) and Ambl^'stoma (on the land). 



simple animals, and from which returning moisture can 

 after many days recall them. 



Changes may also be due to the chemical coinposition 

 of the medium, as was established by the e.xperiments of 



Fig. b^. — Side view of male Ai-temia salina (enlarged). 

 (From Chambers s Encyclop.') 



Schmankewitsch on certain small Crustaceans. Among the 

 numerous species of the brine-shrimp Artetnia, the most 

 unlike are A. salina and A. milhatiscnii ; they differ in the 



