14 INTRODUCTION 



sees in it a reflection of the difference between the 

 two forests, which interests the other less, and only 

 incidentally. 



Rbfbbencbs. a realization of the connexion between the study of 

 the facts of animal distribution and the general theory of evolution may 

 best be obtained from Darwin's Origin of Species and Wallace's Dar- 

 winism. Wallace's classical work on Geographical Distribution (two vols., 

 London, 1876) should also be consulted. An interesting discussion of 

 the purely geographical standpoint will be found in the chapters on 

 animal geography in de Martonne's Traite de Oiographie Physique (Paris, 

 1909), which gives copious references. 



