98 



Asa Arthur Schaejfer 



TABLE V— continued 



At first sight neither Experiment 6 or 7 seems to show that 

 Stentor eats some kinds of food with more readiness than other 

 kinds, for some individuals of each of the various kinds of flagel- 

 lates were eaten while some of every kind were rejected. But 

 upon closer examination it is found that the latter parts of the 

 experiments are difl^erent from the earlier in several respects. 

 A larger proportion are rejected at the end of each of the experi- 

 ments than at the beginning. Of the organisms eaten the variety 

 is much more extensive at the beginning than in the latter part of 

 the experiments. All the organisms that were fed in the begin- 

 ning of both experiments were ingested, but at the close only Eu- 

 glena viridis and Trachelomonas volvocma were ingested, all the 

 other kinds being rejected. Only a single Trachelomonas his- 

 pida was ingested. It is clear that there occurred a change in 

 the physiologic state of Stentor as each of the experiments pro- 

 gressed. In the sixth experiment, of the six different kinds of 

 flagellates that were fed, Euglena viridis and Trachelomonas vol- 

 vocina were eaten with the greatest readiness. After the twenty- 

 second organism had been fed, ten Euglen?e viridis were ingested 

 and five were rejected. The fact that not all the Euglenae were 



