HISTOLOGICAL STUDIES 39 



with the low power and then focus on it with the high power 

 for careful observation. 



Watch the amoeba until it begins to show movement, then 

 draw and note the following parts: round, opaque nucleus, 



B 



FIG. 13. A, Amoeba proieus: a, food vacuole; c, contractile vacuole; ec, ectoplasm; 

 en, endoplasm; n, nucleus; v, water vacuoles. B, Amoeba radiosa. 



the clear outer part (ectoplasm) and the granular inner part 

 (endoplasm) of the cytoplasm. (Cytoplasm is the name given 

 to that part of the protoplasm which is not nuclear, since 

 the nucleus is also composed of protoplasm.) Note, further, 



