X CONTENTS 



CHAPTER VI 



BI-PARENTAL REPRODUCTION 



PAGE 



Bi-parental reproduction said to be a cause of progressive vari- 

 ations A complete error Evidence from the common experiences 

 of life The scientific evidence Equidse Pigs Goats Babbits 

 Sheep Pigeons Fowls Ducks Plants Reversion seldom 

 observable under conditions of Natural Selection Often observ- 

 able under conditions of artificial selection Reversion the cause 

 of the deterioration of useless parts The function of bi-parental 

 reproduction in evolution 67 



CHAPTER VII 



REGRESSION 



Summary The function of regression in evolution Develop- 

 ment in ancient environments Development in new environ- 

 ments The evolution of man's higher faculties The " inadequacy 

 of Natural Selection" The unknown factor Theories of regression 



Germinal selection 86 



. 



CHAPTER VIII 



THE CAUSE OP SPONTANEOUS VARIATIONS 



The inherent tendency to vary Galton's law of inheritance In- 

 breeding and cross-breeding Fertility and sterility The effects 

 of domestication on fertility The geographical distribution of 

 species Summary 95 



CHAPTER IX 



NATURAL SELECTION AMONG CIVILIZED MEN 



The alleged Cessation of Selection among civilized peoples- 

 Civilized man is stringently selected A problem for medical men 

 Inborn .and acquired immunity Doctrines of heredity as ap- 

 plied to problems of disease 106 



CHAPTER X 



. 



ACQUIRED IMMUNITY 



Theories of immunity The kind of diseases against which im- 

 munity may be acquired Pasteur's theory Chauveau's theory 

 The theory of chemical neutralization The theory of habituation 

 Rabies Small-pox Anthrax Snake-venom The rationale of 

 acquired immunity Syphilis 115 



CHAPTER XI 



EVOLUTION AGAINST DISEASE 



The decisive evidence afforded by disease Malaria Tubercu- 

 losis Measles Whooping-cough Small-pox Dysentery Diar- 

 rhoea Enteric fever 134 



