8 MORPHOGENESIS IN CILIATES 



in development, differentiation, division, and evolution. 

 The reader will be perhaps badly shocked by some repeti- 

 tions. But it was not possible to describe morphological 

 phenomena without a single mention of the problems raised, 

 and it was also felt that the theoretical implication of each 

 set of data should be considered separately. Repetitions are 

 the inevitable consequence of this procedure, the counter- 

 part of which should be clarity. 



