INTRODUCTION - Historical Survey Of Theories Or Suggestions Of Chemical
Influence In Heredity

CHAPTER I - Classification And Adaptation

CHAPTER II - Mendelism And The Heredity Of Sex

CHAPTER III - Influence Of Hormones On Development Of Somatic
Sex-Characters

CHAPTER IV - Origin Of Somatic Sex-Characters In Evolution

CHAPTER V - Mammalian Sexual Characters,
Evidence Opposed To The Hormone Theory

CHAPTER VI - Origin Of Non-Sexual Characters: The Phenomena Of Mutation

CHAPTER VII - Metamorphosis and Recapitulation

INDEX


LIST OF PLATES

PLATE I. Recessive Pile Fowls

PLATE II. Abnormal Specimen Of Turbot

PLATE III. Flounder, Showing Pigmentation Of Lower Side
After Exposure To Light