AN AMICRONUCLEATE OXYTRICHA 



501 



descendants, and it did not occur on any of the slides of the 

 present subcultures in which daily isolations were made. Can- 

 nibalism did occur, however, in stock slides of four or more 

 days standing in each of the twenty-eight lines of these sub- 

 cultures. 



i 

 I 

 I 



'.-J 



Fig. 3 Comparisons of cannit)al (broken line) and non-cannibal (continuous 

 line) subcultures begin at points B and C in this figure, which represents graphi- 

 cally the complete history (December 20, 1917, to February 26, 1918) of sub- 

 cultures 3 and 4 (section 3) and of all subcultures of the second experiment in 

 this section. The curves in this figure, with the exception of those drawn with 

 light continuous and broken lines, show combined division rates of several 

 subcultures. The broken line from beginning to A (January 2, 1918) represents 

 the division rate of subculture 3; from A to B (January 22, 1918), the averaged 

 division rates of subcultures 3A, 3C, and 3D; from B to the end of the cm"ve, 

 the division rates of the cannibal subcultures 4A-C, 4A-1C, 4B-C, and 3C-C. 

 The continuous line to A shows division rates of subcultures 4; from A to B, the 

 averaged division rates of subcultures 4A, 4B, 4C, and 4D; from B to the end 

 of the curve the same for the non-cannibal subcultures 4A-N, 4A-1N, 4B-N, and 

 3C-N. The broken line (light) from C (February 9, 1918) to the end of the 

 curve gives the average division rate for subculture 4A-C1, while the continuous 

 line (light) from C to the end of the curve shows the same for subculture 4A-N1. 

 Methods of plotting the same as in figure 1. 



