94 



Asn Arthur Schaeffer 



previous day. As later experiments will demonstrate, however, 

 the ingestion on the day before of the 50 Phacus has probably in- 

 fluenced the behavior of Stentor, and it is pretty certain that the 

 condition of partial satiety which is exhibited in the beginning 



p = Phacus; e = Euglena; s = sulphur; g = glass; t = encysted Trachelomonas volvocina. 



TABLE IV 

 Experiment 4. Selection of Phacus and Euglence from Sulphur and Glass 



Eaten, 15 Phacus and 4 Euglenae. 



Rejected, 8 Phacus, 6 particles of sulphur, 6 particles of glass, and i Trachelomonas. 



of Experiment 4 was due to this cause. I think it will be pretty 

 clearly shown that the rejection of the first three Phacus in Experi- 

 ment 4 was not a "mistake" on the Sten tor's part but probably 

 represents a transition from a condition of partial satiety to one 

 of hunger, brought about by the stimuli of the Phacus upon the 

 pouch and funnel. The Phacus numbered 14, 15, 16, 17 — the last 

 four of a group of nine — were rejected probably because of the 



