iv CONTENTS 



CHAPTER V 



THE CLASSIFICATION OF ANIMALS .... 



Definition of phylum Description of the more important 

 phyla Porifera Ccelenterata Platyhelminthes Ne- 

 mertinea Nematoda Annelida Arthropoda Mollusca 

 Brachiopoda Polyzoa Echinodermata Vertebrata. 



CHAPTER VI 



THE ORIGIN OF SPECIES . . 



Evidence that new species are continually coming into being 

 Darwin's theory of their mode of origin Mendel's 

 researches into the laws of heredity Bearing of these 

 researches on Darwin's theory. 



CHAPTER VII 



THE CONSEQUENCES OF DARWIN'S THEORY. THE INTER- 

 PRETATION OF DEVELOPMENT .... 



The recapitulatory element in development Mutual relations 

 of embryo and larva Relation of migration to the 

 formation of new species. 



CHAPTER VIII 



THE BEARING OF ZOOLOGY ON THE QUESTIONS OF 

 HUMAN ORIGIN AND THE FUTURE DESTINY OF 

 THE RACE . 



The origin of man from apes The decisive factors in the 

 evolution of man Outlook for the future of the British 



APPENDIX 91 



INDEX 93 



