b rilYSIOLOGY OF MUSCLES AND NERVES. 



tion in this case occurs in two ways. Sometimes single 

 processes are seen to protrude from the whole mass ; 

 these processes gradually affect the whole granular 

 mass, so that the whole body is displaced, and a genuine 

 change of position happens to the animal ; or the pro- 

 cesses being again retracted, other similar processes are 

 protruded from another part of the body, in such a way 

 that the direction of motion is changed ; in short, the 

 animal creeps about on the glass plate on which it is ob- 

 served by means of these processes. ^Meanwhile currents 

 of granules can be seen within the mass ; closer obser- 

 vation, however, shows that the motion in this case is 

 only passive, and that it is the result of a continuous 

 wave -like displacement of the protoplasm. 





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Fi(i. 1. A.M(i;r..K. 

 a. Amoeba verrucosa, b. Amceba poiTccta. 



5. Movements entirely similar to those in these 

 independent living animals, called Amoehw^ occur in 



