248 

 A 



B 

 C 

 D 

 E 

 F 

 G 

 H 



FOUNDATIONS OF BIOLOGY 



Fia. 131. Diagram of the nuclear changes during endomixis in Parameeium aurelia. 

 A, typical nuclear condition; B, degeneration of macronucleus and first division of 

 micronuclei; C, second division of micronuclei; D, degeneration of six of the eight 

 micronuclei; E, division of the cell; F, first reconstruction micron uclear division: 

 G t second reconstruction micronuclear division; H, transformation of two micronuclei 

 into macronuclei; /, micronuclear and cell division; J, typical nuclear condition 

 restored. 



