CHAPTER II 



SEX IN TERMS OF INTERNAL SECRETIONS 



Continuity of germplasm ; The sex chromosome ; The 

 internal secretions and the sex complex ; The male 

 and the female type of body ; How removal of sex 

 glands affects body type ; Sex determination ; Share 

 of egg and sperm in heredity ; Nature of sex — sexual 

 selection of little importance ; The four main types 

 of secretory systems ; Sex and sex-instincts of rats 

 modified by surgery ; Dual basis for sex ; Opposite- 

 sex basis in every individual ; The Free-Martin cattle ; 

 Partial reversal of sex in man. 



In Chapter I, the " immortahty " of the 

 protoplasm in the germ cells of higher animals, 

 as well as in simpler forms without distinct 

 bodies ,was mentioned. In these higher animals 

 this protoplasm is known as germplasm, that 

 in body cells as somatoplasm. 



All that is really meant by " immortality " 

 in a germplasm is continuity. That is, while 

 an individual may consist of a colony of milhons 

 of cells, all of these spring from one cell and it 

 a germ cell — the fertilized ovum. This first 

 divides to form a new group of germ cells, which 

 are within the embryo or new body when it 

 begins to develop, and so on through indefinite 



i8 



