Vlll 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 VL 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 SEXUAL 



GENESIS ....... 428 



VII. ANTAGONISM BETWEEN DEVELOPMENT AND GEN 

 ESIS, ASEXUAL AND SEXUAL . . . 440 



VIII. ANTAGONISM BETWEEN EXPENDITURE AND GENESIS 440 



IX. COINCIDENCE BETWEEN HIGH NUTRITION AND GEN 

 ESIS ... . 454 



X. SPECIALTIES OF THESE RELATIONS . .463 



XL 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 . . . .536 



