VUl CONTENTS. 



CHAP. PAGE 



VIII. HEEEDITY 239 



IX. VAEIATIOX ..... 257 



X. GENESIS, HEREDITY, AND YAEIATION . . 273 



XI. — CLASSIFICATION ....... 292 



XII. DISTEIBUTION ....... 311 



FAET III.— THE EVOLUTION OF LIFE. 



I. PEELIMINAEY ....... 331 



II. — GENEEAL ASPECTS OF THE SPECIAL-CEEATION-HY- 



POTHESIS . . ... 333 



in. GENEEAL ASPECTS OF THE EVOLUTION-HYPOTHESIS 316 



\V. THE AKGUMBNTS FEOM CLASSIFICATION . 356 



Y. — THE AEGUJIENTS FEOJI EJIBEYOLOGY . 3<55 



VI. — THE AEGTJMENTS FEOJI MOEPHOLOGY . 380 



ril. THE AEGUMENTS FEOM DISTEIBnTION . 388 



VIII. — HOW IS 0E6ANIC EVOLUTION CAUSED? . 402 



IX. — EXTEENAL FACTOES ... . 411 



X. INTEENAL FACTOES 420 



XI. DIEECT EQUILIBRATION . . 432 



XII. — INDIEECT EQUILIBEATION . . 443 



XIII. THE CO-OPEEATION OF THE FACT(JKS . 464 



XIV. THE CONVEEGENCE OF THE EVIDENCES . . 470 



