290 



HEREDITY IN THE PROTOZOA 



B' 



B 



Fig. 68. — Arcella dentata. A, normal individual with two nuclei. 

 B, individual cut so as to include onl}^ 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. 



