PERIODIC REORGANIZATION OF P. CAUDATUM 



67 



Now Hertwig '14, reviewing and commenting on our prelimi- 

 nary paper ('14,11) on the reorganization process of Paramaecium 

 aurelia, in the light of his theoretical beliefs in regard to depres- 

 sion in Protozoa, shows in his text figure 3, animals 4 and 5 

 (copied as text fig. 3 in this paper) the breaking up of the macro- 

 nucleus together with the formation of two micronuclei. These 

 stages correspond somewhat to our stages (figs. 8, 9, 10 and 11) 

 at the end of the descending phase of the reorganization process 

 when the first or second 'reduction' division has occurred. But 

 it is clear that Hertwig has confused two different series of 

 phenomena: animals with hypertrophied macronucleus and not 



Text figs. 3 and 4 Paramaecium caudatum. 

 Kasanzefi". 



From Hertwig, '14, after 



clearly discernible changes in the micronucleus, with those of 

 the reorganization process which we have described as endomixis 

 (cf . text fig. 3, copied from Hertwig) . We have never found in the 

 thousands of isolated animals studied that the macronucleus 

 was enlarged by any means to such a degree as Hertwig figures 

 in his text figure 3, animals 1, 2, 3, from vhich we have copied 

 the second animal as our text figure 4. 



The crucial stage, i.e., the total reorganization of the nuclear 

 apparatus with the formation of the macronuclear anlagen, 

 could not have been determined as a phase of the reorganization 



