INTRODUCTION 13 



habits, its relations to other animals, whether as friends, as 

 enemies, or as prey, to the vegetable kingdom, and to its 

 physical surroundings, such as temperature, humidity, &c. 

 In a word, the whole question of the relation of the organ- 

 ism to its environment gives us a final and most important 

 branch of Natural History which has been called Ethology 

 or Bionomics, 



