16 CELL STRUCTURE 



a hard substance, called liine, and depositing the same as a 

 kind of shell around themselves. 



9. Cell Motion. It is reasonable to suppose that many of 

 the. cells of the human body are capable of some motion, 

 although this cannot be demonstrated, except in very few in- 

 stances. It is easy to demonstrate that the white corpuscles 

 of the blood are capable of independent motipn, very similar 

 to that of the Amoeba. They are able to push their way 

 through the walls of the capillaries, and thus wander through 

 all parts of the body. 



9. What range of motion has a oett? 



