PROTOZOA 



181 



the Amoeba is not easy to secure, but if a few sticks and 

 leaves with their accompanying ooze from a stagnant pond 

 be placed in a dish of water in an east or north window, 



FIG. 211. A, Amoeba proteus; B, Amoeba radlosa. n, nucleus; c, contractile 

 vacuole ; a, food engulfed ; ec, one of the nine pseudopods. After .Leidy. 



and a little green scum or water alga3 added, large numbers 

 usually develop. To secure them for study, scrape a little 

 of the slime from a stick or leaf upon a glass slip, place on 

 the cover glass, and examine with the low power. An 



