190 THE MAIN CURRENTS OF ZOOLOGY 



advanced student who has need of zoological refer- 

 ences on subjects not included will know how to go 

 about finding them. The general reader will also 

 find additional biographical sketches as well as 

 general topics referred to in the indices of the period- 

 ical literature with which nearly all libraries are 

 provided. 



It has seemed desirable to give, first, a suggested 

 list of fifty books for the nucleus of a reference li- 

 brary, and to follow this list with additional titles of 

 books and articles in which the reader may find food 

 for various kinds of internal hunger which he may 

 feel from time to time for supplementary reading. 



