234 



GARY N. CALKINS 

 X Series: 2nd C.scle 



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Chart B 



The third cycle {March 9 to date, April 26): Individual X 



After encystment of all individuals in culture and stock dishes 

 the race was recovered on March 8th as before, by adding fresh 

 water and food to a stock dish set aside on the 27th of February. 

 By the 3rd of March all of these had encysted. Five days later 

 100 cysts were picked out and placed in fresh water with Parame- 

 cium caudatum. On the following day (March 9) there were 



