CONTENTS

CHAPTER I.

Introductory: The Darwinism of Darwin and of the Post-Darwinian Schools[1]

CHAPTER II.

Characters as Hereditary and Acquired (Preliminary)[39]

CHAPTER III.

Characters as Hereditary and Acquired (Continued)

A. Indirect evidence in favour of the Inheritance of Acquired Characters[60]

B. Inherited effects of Use and of Disuse[95]

CHAPTER IV.

Characters as Hereditary and Acquired (Continued)

C. Experimental evidence in favour of the Inheritance of Acquired Characters[103]

CHAPTER V.

Characters as Hereditary and Acquired (Continued)

A. and B. Direct and Indirect Evidence in favour of the Non-inheritance of Acquired Characters[133]

C. Experimental Evidence as to the Non-inheritance of Acquired Characters[142]

CHAPTER VI.

Characters as Hereditary and Acquired (Conclusion)[150]

CHAPTER VII.

Characters as Adaptive and Specific[159]

CHAPTER VIII.

Characters as Adaptive and Specific (Continued)

I. Climate[200]

II. Food[217]

III. Sexual Selection[219]

IV. Isolation[223]

V. Laws of Growth[226]

CHAPTER IX.

Characters as Adaptive and Specific (Continued)[228]

CHAPTER X.

Characters as Adaptive and Specific (Concluded)[251]

Summary[274]

Appendix I. On Panmixia[291]

Appendix II. On Characters as Adaptive and Specific[307]

Note A to Page 57[333]

Note B to Page 89[337]