376 ELEMENTARY BIOLOGY. [CHAP. VIII. 



Note 



1. Size; (measure). 



2. Form; changing much like that of the Amoeba, but 

 less actively. Draw at intervals of ten seconds. 



3. Structure; Some more and some less granular; 

 ectosarc and endosarc less distinct than in the 

 Amoeba. Nucleus rarely visible in the fresh state. 

 No contractile vesicle. 



4. Treat with dilute acetic acid: the whole is clarified 

 and a nucleus is brought into view in a more or less 

 central position. Occasionally two nuclei may be 

 seen. 



5. Stain with magenta; the whole becomes coloured, 

 the nucleus most intensely. 



6. Place a fresh preparation on the hot stage, and 

 gradually warm up to 50 C. The movements are 

 at first rendered more active, but ultimately cease, 

 the pseudopodia-like processes being all retracted 

 and the whole forming a motionless sphere. 



