REPRODUCTION 



119 



remain in one daughter cell after division" (Calkins). Hayes 

 noticed a similar division, but at the time of simultaneous divi- 

 sion prior to cell division, each macronucleus become elongated 

 and breaks into several small nuclei. 



Fig. 48. Nuclear and cj'tosomic division of Paramecium caudatum as 

 seen in stained smears, X260 (Kudo). 



The macronucleus becomes at the time of its division somewhat 

 enlarged and its chromatin granules are more deeply stained than 

 before. Since the number of chromatin granules appear ap- 

 proximately the same in the macronuclei of different generations 



