xii CONTENTS. 



CHAP. PAGK 



V. — Physiological integration in plants .... 292 

 VI. — Differentiations between the outer and inner tissues 



OF ANIMALS 299 



VII. — Differentiations among the outer tissues of animals . 309 



VIII. — Differentiations among the inner tissues of animals . 323 



IX. — Physiological integration in animals .... 373 



X. — Summary of physiological development .... 384 



X\ — The integration of the organic world .... 396 



PAET VI.— LAWS OF MULTIPLICATION. 



I. — The factors 411 



II. — A PRIORI principle , .417 



III. — Obverse a PRIORI principle 424 



IV. — Difficulties of inductive verification .... 432 



V. — Antagonism between growth and asexual genesis . 439 



VI. — Antagonism between growth and sexual genesis . . 448 

 VII. — The antagonism between development and genesis, 



ASEXUAL AND SEXUAL 461 



VIII. — Antagonism between expenditure and genesis . . 467 



IX. — Coincidence between high nutrition and genesis . . 475 



X. — Specialities of these relations 486 



XL — Interpretation and qualification 497 



XII. — Multiplication of the human race 506 v 



XIII. — Human population in the future 522 



APPENDICES. 



A. — Substitution of axial for foliar organs in plants . . 541 

 B. — A criticism on Prof. Owen's theory of the vertebrate 



skeleton 548 



C. — On circulation and the formation of wood in plants . . 567 



D. — On the origin of the vertebrate type 599 



D 2 . — The annulose type 602 



E. — The shapes and arrangements of flowers .... 608 



P. — Physiological (or constitutional) units .... 612 



C— The inheritance of functionally-caused modifications . 618 



