REPRODUCTION 



121 



Fig. 50. The solation of chromatin during the macronuclear division 

 of Chilodonella cuculhilus, positive to Feulgen's nucleal reaction, 

 X1800 (Reichenow). 



tion plane") and a stained zone (''solution plane"), appears at 

 each end of the macronucleus (Fig. 51, a) and as each moves 

 toward the middle, a more chromatinic area is left behind (h-d). 

 According to Summers (1935), a similar change occurs in Dio- 



FiG. 51. Macronuclear reorganization before division in Euplotes 

 patella, X240 (Turner), a, reorganization band appearing at a tip of 

 the macronucleus; b-d, later stages. 



