

MY LIFE 



can thus sec what arc the deficiencies in his collection, and 

 from what countries he most needs additional Species; and all 



this Information I wished to give him, as T had often felt 



the want of it myself. This part of the work I termed 

 " ideographical zoology," and to this I gave special attention, 

 and have ^iven for every family of mammals, birds, and rep- 

 tiles a diagram, which in a single line exhibits its distribution 

 in each of the four subregions of the six regions. To give the 

 reader some idea of this compact method of summarizing 

 information, I will give here its application to one family of 

 mammalia : 



Here the distribution of the true deer over the earth is 

 shown at a glance when once the limits of the regions and 

 subregions are learnt, as marked on the general and special 

 maps by which the book is illustrated. The work was pub- 

 lished in 1876, in two thick volumes, and it had occupied a 

 good deal of my time during the four years I lived at Grays. 

 As this book, being very costly and technical, is less known 

 to English readers than any of my other works, I will here 

 give the titles of the chapters, which will sufficiently indicate 

 the range of subjects treated in its eleven hundred pages: 



Part I. — The Principles and General Phenomena of 



Distribution. 



Chap. I. 



„ II. 

 III. 



» 



» 



IV. 

 V. 



Introductory. 



The means of Dispersal and the Migrations of Animals. 

 Distribution as affected by the Conditions and Changes 

 of the Earth's Surface. 

 The Zoological Regions. 



Classification as affecting the Study of Geographical Dis- 

 tribution. 



