472 



LORANDE LOSS WOODRUFF AND RH. ERDMANN 



lines seventeen were killed intentionally, while of the remaining 

 four lines, three died during or shortly after the process. Some 

 of these animals showed irregular divisions resulting in very 

 small cells which apparently lacked the power of growth. It is 

 important here to emphasize that fatalities may occur as a result 

 of faulty reorganization during the process just as has so often 

 been observed to occur in conjugating animals. Both conjuga- 

 tion and the reorganization process, however, are normal phe- 

 nomena which have no pathological features. 



Ji 



Ja 



III 4189 



III 4191i 

 Text figure 14 



III 4191j 



The detailed discussion of Lines I to VI and their branches 

 and subbranches gives clear evidence that the process, resulting 

 in a reorganization of the nuclear apparatus which simulates 

 typical conjugation, is going on with strictly determined morpho- 

 logical and physiological features at relatively definite periodic 

 intervals of time in the pedigreed race of Paramaecium aurelia 

 which is the basis of this investigation. 



