236 



GARY N. CALKINS 



Y Series: 1st Cycle 



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Chart C 



day, and for the second 20 days only 1.05 per day, and the 

 cycle came to an end with encystment of all living material at 

 the end of 40 days. This cycle included only 84 generations, 

 giving a total of 212 generations for the series in culture. 



The rate of encystment was fairly high throughout this cycle 

 and went up rapidly during the last four 5-day periods (chart D, 

 bottom), while the death rate showed a slight increase over that 

 of the first cycle. 



Notwithstanding the relatively low division rate, the appetite 

 was remarkably good, nearly 88 per cent of the Paramecium 

 being eaten daily for the first 25 days (chart D, dotted line). 



