HEREDITY IN THE PROTOZOA 289 
yp Pe 
ae SENS 
Fig. 67.—Parent and immediate offspring in 6 diverse strains or 
families of Difflugia corona, to show the variation and the inheritance by 
the progeny of the parental] diversities. (After Jennings.) 
individuals, and allowing their offspring to multiply, 
forming a population. The members of such a group 
were then measured. It was found that the charac- 
ter at first selected was present in the offspring. 
In some cases selection ceased after a certain peculi- 
