CHAPTER XVI 

 SOME USEFUL BOOKS 



THE books and periodical articles in the field of 

 zoology are so numerous and cover such a wide 

 range of topics that some sort of guide to the best 

 reading is nearly indispensable. 



A continually increasing number of persons take 

 an interest in the larger ideas that have developed 

 from the critical investigation of animals, and this 

 class of readers often seek for palatable and satis- 

 fying literature on zoological subjects. 



The writings appeal to various kinds of interest 

 there are the more popular and the more technical. 

 In selecting reading we must recognize that refer- 

 ences which are good for one purpose often are not 

 good for another. Moreover, the focus of interest of 

 the reader varies with his mood as well as with his 

 purpose, and the selection of suitable reading for 

 different needs is a matter of no little difficulty. 



There are informing books about insects, birds and 

 protozoa, but these will not be specifically adapted 

 to one whose chief interests are in evolution or 

 genetics. 



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