560 ASA A. SCHAEFFER 



may therefore have been milder. The turning to the left may- 

 have been the resultant of two tendencies: moving forward, and 

 getting away from the carmine as quickly as possible. 



The ameba moved over the same carmine grain when placed 

 in its path a few minutes later — 70. When placed in front of the 

 ameba for the third time — 72 — the tip of the main pseudopod 

 forked, one prong flowing under the carmine, while the other be- 

 came the main pseudopod through which the ameba moved away. 

 The carmine grain which had been used in the first experiment 

 was now placed in front of the ameba — ^78. A pseudopod thrown 

 out on the left indicated a tendency to avoid the carmine, but 

 another pseudopod thrown out under the carmine showed a 

 slight positive reaction. The ameba finally moved ofT through 

 the middle pseudopod leaving the carmine behind. 



A piece of carmine of grade 4 which w^as placed in the ameba's 

 path, produced a peculiar change of behavior — 84. A pseudopod 

 was sent out on the side on which the carmine lay, but anterior 

 to it. The pseudopod flowed straight on carrying the ameba 

 away. • The cause of the formation of the pseudopod was un- 

 doubtedly some quality the carmine possessed. Another grain 

 of carmine of grade 4 was then definitely avoided — 87. 



The same piece of carmine which had been used in the begin- 

 ning of the experiments was laid in the ameba's path for the sixth 

 time — 89 — but the subsequent behavior was so irregular that it is 

 difficult to say just what part was produced by the carmine. 

 What seemed to be a spathidium was then quickly ingested in a 

 food cup containing a considerable amount of water — 92. This 

 show^s that the ameba was actually hungry at this time, and that 

 the preceding behavior where carmine was refused was not due 

 to lack of hunger through fatigue or any other cause. 



A grain of almost insoluble egg white was then placed in the 

 ameba's path three times in succession — 95. It was reacted to 

 with more or less indifference. 



A fresh grain of carmine of grain 2 was then laid in front of 

 the ameba — 107. A food cup was at once formed over the car- 

 mine but only about three-fourths of it was included within the 

 cup. The ameba then remained almost motionless for about 



