AMEBOID MOVEMENT 



Figure 14. Illustrating the movement of a particle on the upper surface 

 layer of an Amoeba sphaeronucleosus. Length of the ameba, 120 microns. 



ameba moves forward, shown by successive outlines, the particle 

 likewise moves forward, but, as will be observed, at a more rapid 

 rate. Measuring the distance from particle outline i to 4, and 

 from ameba outline i to 4, it is seen that the rate of move- 

 ment of the particle compares w r ith the rate of movement of the 

 ameba as 2.48 to i. 



Particles lying near the side do not move forward as rapidly 

 as those lying in the middle. Figure 15 shows two particles, one 

 of which, a, lying near the middle of the ameba, moved 2.6 times 

 as fast as the ameba advanced in the region of the particle ; while 

 particle b moved only 1.9 as fast as the ameba in front of the 



Figure 15. An Amoeba sphaeronucleosus with two particles attached 

 to its upper surface film, one in the middle and one at the side, a moved 

 2.6 times as fast as the ameba while b, lying nearer the side, moved only 

 1.9 times as fast as the ameba. Length, 100 microns. 



