

CoiXfglts/^^^iii^ 



PREFACE X: * K^^ ^ 



AUTHOR'S PREFACE . . ^^ ^ ^P^ . . viii 



LIST OF ILLUSTRATIONS xv 



EXPLANATION OF SIGNS xviii 



CHAPTER I. 



SEXUAL DIMORPHISM AND THE SECONDARY SEXUAL 



CHARACTERS i 



CHAPTER 11. 



THE RESULTS OF CASTRATION 5 



A. The Results of Castration in Man ... 5 



Observations ........ 6 



Theoretical . . . . . . . . 15 



B. The Results of Castration in Mammals . . 18 



1. Morphological Signs of Castration . . , 18 



2. The Psycho-sexual Behaviour of the Mammal . 33 



C. The Results of Castration in Birds . • , 36 



Observations ....... 36 



Theoretical ........ 46 



D. The Results OF Castration IN THE Frog AND IN Fishes 51 



E. The Results of Castration in Arthropoda . . 55 



1. Moths 55 



2. The Parasitic Castration of Crabs . . . 59 



3. The Parasitic Castration of Insects ... 66 



F. The Results of Castration in other Invertebrata 67 



G. Summary ........ 70 



Bibliography ........ 71 



CHAPTER III. 



THE INTERNAL SECRETIONS OF THE SEXUAL GLANDS 79 



A. Transplantation . . . . . . .81 



B. Feeding with Sexual Gland .... 92 



C. Injection ........ 93 



D. Internal Secretion of the Sex Glands and Nervous 



System ........ 97 



1. Is there an Accumulation of the Internal Secretion 



in the Central Nervous System? ... 97 



2. Physiology of the Clasp Reflex .... 98 



3. The Pyscho-sexual Behaviour of Man . . 102 



Bibliography . . . . . . . .105 



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.3y/ 



