EFFECTS OF AMPHIMIXIS ON THE GERM-PLASM 



■39 



The process of mingling the ids would proceed most rapidly 

 if the paternal and maternal ids regularly combined each time 

 amphimixis took place, so as to bring together the half of the 

 different kinds of ids in the idants of both parents. If, for in- 



Father. 



Mother. 



Offspriiig. 



GENERATION I. 



GENERATION II. 



GENERATION III. 



GENERATION IV. 



Fig. 19. — Diagram illustrating the composition of the idants out of individually 

 different ids. (From Weismann's ' Essays,' Vol. I., p. 369.) 



stance, each idant in an individual consisted of sixteen ids which 

 were all similar to one another on the first appearance of sexual 

 reproduction, the first occurrence of amphimixis would result in 

 idants consisting of eight paternal and eight maternal ids, which 

 are represented respectively by the black and white parts in the 



