Part Vi.--Laws of Multiplication.

I.--THE FACTORS 411

II.--À PRIORI PRINCIPLE 417

III.--OBVERSE À 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

XI.--INTERPRETATION AND QUALIFICATION 497

XII.--MULTIPLICATION OF THE HUMAN RACE 506

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

F.--PHYSIOLOGICAL (OR CONSTITUTIONAL) UNITS 612

G.--THE INHERITANCE OF FUNCTIONALLY-CAUSED MODIFICATIONS 618