290 HEREDITY IN THE PROTOZOA 
1 
B B B* 
Fig. 68.—Arcella dentata. A, normal individual with two nuclei. 
B, individual cut so as to include only one nucleus. B', offspring of B 
B?, offspring of B'. (After Hegner.) 
arity had been produced. The effects of the previous 
selection were still observable after several gener- 
ations had passed, although the difference some- 
times declined. 
