CONTENTS xxvii 



CHAPTER XXXVIII 



Distribution of Land Animals paqh 



Extent of the Subject 473 



Means of Dispersal 473 



Tangible Barriers 474 



Intangible Barriers 475 



Laws and Results of Distribution 475 



Animals of Oceanic Islands 476 



Zoological Realms 477 



Holarctic Realm 477 



Neotropical Realm 478 



Ethiopian Realm 479 



Oriental Realm 479 



The Australian Realm 479 



Realm Subdivisions 480 



Migrations of Animals 481 



CHAPTER XXXIX 



Distribution of Life in the Ocean 



Physical Characters 482 



Temperature of the Sea 483 



Effect of Ocean Currents 483 



Pressure 483 



Light 484 



Distribution of Shore Plants 484 



Floating Plants 485 



Plankton 486 



Unicellular Organisms and Bottom Deposits 487 



Some Pelagic Many-Celled Animals 488 



Organs of Flotation 488 



Animals of the Sea Floor 490 



Phosphorescence 490 



Summary 491 



Section 12. Man 



CHAPTER XL 



The Evolution of Man 



Time Required for Man's Evolution 495 



Place of Origin 495 



Earlier History of the Human Race 496 



The Java Man- Ape 497 



The Piltdown Man 498 



Other Traces of Man's Antiquity 498 



The Neanderthal Man 499 



Modern Man r 500 



Cro-Magnon Man 500 



Later European Races 502 



Man in America 502 



Sub-Species of Modern Man 503 



Man's Future 504 



