AMEBOID MOVEMENT 

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57 



Figure 23. Showing the movement of a particle on the surface layer 

 of an Amoeba discoides. The particle remained on the anterior end of 

 the ameba for several minutes after stage 13. The ameba was about 320 

 microns long. 



the particle moved faster twice as fast as the ameba from 9 tcv 

 10. Stages n, 12, 13 are added to show that the particles do not 

 tend to go to the under surface but remain at .or very near the 

 tip. The slight irregularity of the waves of hyaloplasm pushed 

 out at the anterior end accounts for the changing position of 

 the particle after it has reached the anterior edge. The particle 

 remained at the edge of the advancing ameba for several minutes 

 after the stage drawn at 13. 



In another observation the effect of a narrowing of the ad- 

 vancing tip of the ameba is shown very well. In figure 24 the 

 ameba was advancing with a broad anterior end, as shown at i 

 and 2. From 2 to 4, the region where new ectoplasm was made, 



