viii CONTENTS. 



CHAP. PAGE 



VI. DIFFERENTIATIONS BETWEEN THE OUTER AND IN- 

 NER TISSUES OF ANIMALS .... 282 

 VII. DIFFERENTIATIONS AMONG THE OUTER TISSUES 



OF ANIMALS 291 



VIII. DIFFERENTIATIONS AMONG THE INNER TISSUES OF 



ANIMALS 310 



IX. PHYSIOLOGICAL INTEGRATION IN ANIMALS . . 365 



X. SUMMARY OF PHYSIOLOGICAL DEVELOPMENT. . 377 



PART VI. LAWS OF MULTIPLICATION. 



I. THE FACTORS 391 



II. A PRIORI PRINCIPLE . . . . . .397 



III. OBVERSE A PRIORI PRINCIPLE .... 404 



IV. DIFFICULTIES OF INDUCTIVE VERIFICATION . .412 



V. ANTAGONISM BETWEEN GROWTH AND ASEXUAL 



GENESIS 419 



VI. ANTAGONISM BETWEEN GROWTH AND SEXUA'L 



GENESIS 428 



VII. ANTAGONISM BETWEEN DEVELOPMENT AND GEN- 

 ESIS, ASEXUAL AND SEXUAL . . . 440 

 VIII. ANTAGONISM BETWEEN EXPENDITURE AND GENESIS 446 

 IX. COINCIDENCE BETWEEN HIGH NUTRITION AND GEN- 

 ESIS . 454 



X. SPECIALTIES OF THESE RELATIONS . . .463 



XI. INTERPRETATION AND QUALIFICATION . . . 470 



XII. MULTIPLICATION OF THE HUMAN RACE . . 479 



XIII. HUMAN POPULATION IN THE FUTURE . . . 494 



APPENDICES. 



A. SUBSTITUTION OF AXIAL FOR FOLIAR ORGANS IN 



PLANTS 511 



B. A CRITICISM ON PROF. OWEN's THEORY OF THE VER- 

 TEBRATE SKELETON . . . . .517 



C. ON CIRCULATION AND THE FORMATION OF WOOD IN 



PLANTS . 530 



