Vlll CONTENTS. 



CHAP. PAGE 



VI. DIFFEEENTIATIONS BETWEEN THE OUTER AND IN- 

 NEE 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 . . 3Y7 



PART YI.— LAWS OF MULTIPLICATION. 



I. THE FACTORS 391 



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



III. OBVERSE A PRIORI PRINCIPLE .... 404 



n'. 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 446 



IX. COINCIDENCE BETWEEN HIGH NUTRITION AND GEN- 

 ESIS . 

 X. — SPECIALTIES OF THESE RELATIONS 

 XI. — INTERPRETATION AND QUALIFICATION . 



XII. MULTIPLICATION OF THE HUMAN RACE 



XIII. HUMAN POPULATION IN THE FUTURE . 



454 

 463 

 470 

 479 

 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 



