—Genesis, heredity, and variation—Concluded 356 XI. —Classification 374 XII. —Distribution 395 PART III.—THE EVOLUTION OF LIFE. I. —Preliminary 415 II. —General aspects of the special-creation-hypothesis 417 III. —General aspects of the evolution-hypothesis 431 IV. —The arguments from classification 441 V. —The arguments from embryology 450 VI. —The arguments from morphology 468 VII. —The arguments from distribution 476 VIII. —How is organic evolution caused? 490 IX. —External factors 499 X. —Internal factors 508 XI. —Direct equilibration 519 XII. —Indirect equilibration 529 XIII. —The co-operation of the factors 549 XIV. —The convergence of the evidences 554 XIVA. —Recent criticisms and hypotheses 559 APPENDICES. A. —The general law of animal fertility 577 B. —The inadequacy of natural selection, etc. 602 C. —The inheritance of functionally-wrought modifications: a summary 692 D. —On alleged "spontaneous generation" and on the hypothesis of physiological units 696 FIRST PRINCIPLES By Herbert Spencer CONTENTS PART I.-THE UNKNOWABLE. CHAP. PAGE I.- RELIGION AND SCIENCE 3 II.- ULTIMATE RELIGIOUS IDEAS 25 III.- ULTIMATE SCIENTIFIC IDEAS 47 IV.- THE RELATIVITY OF ALL KNOWLEDGE 68 V.- THE RECONCILIATION 98 PART II.-LAWS OF THE KNOWABLE. I.- LAWS IN GENERAL 127 II.- THE LAW OF EVOLUTION 146 III.- THE LAW OF EVOLUTION (CONTINUED) 175 IV.- THE CAUSES OF EVOLUTION 219 V.- SPACE, TIME, MATTER, MOTION, AND FORCE 224 VI.- THE INDESTRUCTIBILITY OF MATTER 238 VII.- THE CONTINUITY OF MOTION 246 VIII.- THE PERSISTENCE OF FORCE 251 IX.- THE CORRELATION AND EQUIVALENCE OF FORCES 259 xiiX.- THE DIRECTION OF MOTION 286 XI.- THE RHYTHM OF MOTION 313 XII.- THE CONDITIONS ESSENTIAL TO EVOLUTION 335 XIII.- THE INSTABILITY OF THE HOMOGENEOUS 358 XIV.- THE MULTIPLICATION OF EFFECTS 388 XV.- DIFFERENTIATION AND INTEGRATION 416 VI.- EQUILIBRATION 440 XVII.- SUMMARY AND CONCLUSION 487 End of the Project Gutenberg EBook of Index of the Project Gutenberg Works of Herbert Spencer, by Herbert Spencer