AMEBOID MOVEMENT 



47 



Figure 12. Illustrating the high degree of elasticity in the pseudopods 

 of Biomyxa vagans. In a and b are shown two stages of a small section 

 of the pseudopodial network, which remained unchanged while a small 

 lump of protoplasm (near the arrow) moved rapidly up and down the 

 slender pseudopod. Movement along the whole length of the pseudopod 

 occupied about half a second. Just exactly what the movement was due 

 to could not be determined, but the distance between the forks in the 

 pseudopod did not change, nor did the thickness of the protoplasmic 

 strand on which the protoplasmic lump moved change noticeably. 



pseudopods, is undoubtedly conditioned by the structure of the 

 protoplasm, both physically and chemically, but more especially 

 the latter. 



