72 A. A. SCHAEFFER 



leaving the lactalbumin behind. Once more the same piece of 

 lactalbumin was laid in the ameba's path (774). The ameba 

 moved forward and passed it on the left. A side pseudopod was 

 thrown out on the right just anterior to the lactalbumin, when 

 the lactalbumin lay near the mid-region of the ameba. The lac- 

 talbumin was partly surrounded by protoplasm when it came 

 near the posterior region, but it was released as the ameba 

 moved forward. In the next experiment a new piece of lactal- 

 bumin was brought near the tip of the ameba (780). The ameba 

 moved straight forward into contact with the lactalbumin and 

 then started to pass it on the right. But when the tip of the 

 main pseudopod had moved beyond the test object, a pseudopod 

 was thi'own out toward it. The lactalbumin was ingested ap- 

 parently, but the ameba did not quiet down nor change its direc- 

 tion of movement. One and one-half minutes later the lactal- 

 bumin was left behind. The same piece of lactalbumin was 

 again laid near the anterior edge of the ameba (789). The ameba 

 passed it on the right. A pseudopod was sent out anterior to it 

 when it came to lie in contact with the mid-region of the ameba. 

 The test object seemed again to be partly surrounded by proto- 

 plasm when it came to lie near the posterior end, precisely as 

 was observed in figures 774 to 777 in similar circumstances. Fi- 

 nally the ameba left the lactalbumin behind. But the test object 

 was again laid in the ameba's path (795). The resulting reac- 

 tions were very similar to those in the experiment just preceding. 

 The lactalbumin was then for the fourth time laid in front of the 

 ameba (800). The behavior that was observed was again very 

 similar to that of the two preceding experiments. To test the 

 degree of hunger a piece of globuln was next presented (806). 

 Although it was eaten at once in a typical food cup, no resting 

 period followed. A fresh grain of lactalbumin was then laid 

 near the tip of the ameba (813). The ameba flowed past it on 

 the right. A pseudopod was sent out anterior to it when it had 

 come to he in contact with the mid-region of the ameba. When 

 it came to lie at the posterior end of the ameba it was surrounded 

 by protoplasm and ingested. The ameba then became a little 

 less active for a few minutes, but it finally moved away in the 



