Heredity in Protozoa 



617 



pierced part became very small; later it increased in size and 

 became irregular (Fig. 19, c). The fission was never completed, 

 this irregular part remaining attached to the posterior end of 

 the normal individual mbK 



The normal part mb^ divided twice, budding off, as it were, two 

 normal individuals at its anterior end; its posterior part remained 

 with the irregular mass attached, as in Fig. 19, J. 



At the next division the two components remained connected, 

 with the irregular mass attached to the posterior end (Fig. 19, e). 



Fig. 19 Effect of mutilation during fission in the specimen mb. See text. 



The irregular mass had itself made some attempts at fission, with 

 the result that it became still more irregular. 



There was no further change for three days; then another partial 

 fission produced the results shown in Fig. 19, /. 



During the next day the entire structure disintegrated. In this 

 case the effects of the mutilation lasted for several generations, 

 finally causing death. 



All together, it is clear that while mutilations may be passed on 

 bodily to certain of the products of division for a number of gener- 

 ations, there is no tendency for them to be inherited by all the 



