PHYSIOLOGY OF THE INVERTEBRATA. 373 



lent of mind, and which is capable of developing with every 

 generation — i.e., according to the Darwinian law. 



But it is not our intention to go fully into the subject of 

 animal intelligence as displayed in various groups of the 

 Invertehrata ; such information the reader will obtain by con- 

 fiulting special treatises devoted to this fascinating subject.* 



* Morgan's Animal Life and Intelligence ; Eomanes' Animal Intelligence ; 

 and Lubbock On the Semes, Instincts, and Intelligence of Animals, with special 

 reference to Insects, 



