CONTENTS 



CHAP. PAGE 



Introduction 



I. History of Geographical Distribution ... 3 



II. Features of Environment . . . . . 18 



Tropical Forests . . 18 



Deserts 30 



High Mountains and Vertical Distribution . 43 



III. Spreading .... ... 61 



IV. Numbers and Density of Species ... 69 



V. Former Configurations of Land and Water . . 76 

 VI. Distribution of Selected Groups . . . . 87 



Bibliography 143 



Index 146 



