40 ZOOLOGY DIRECTIONS 



9. Nucleus. Find in living specimen. Describe its ap- 

 pearance. Does its form change ? Does its position change ? Is 

 there more than one nucleus'? Notes required. 



10. Make a careful drawing 100 mm. in diameter, of the 

 living Amoeba under the high power, labelling all parts. Stipple 

 one pseudopodium to show structure of endoplasm and its in- 

 clusions and in addition show structure of other important parts 

 such as nucleus and vacuoles which may not be included in this 

 pseudopodium. In the remainder of the body indicate division 

 between ectoplasm and endoplasm by a dotted line, 



11. AVith the aid of ocular micrometer find the approxi- 

 mate size of an Amoeba (see page 14, section 6). 



IV. Experiment. Notes required. 



1. Object : to determine the effect of a mechanical stimu- 

 lus upon an Amoeba, 



Clamp slide firmly to stage and gently tap the coverglass 

 with a needle. Results? 



V. While completing the work on Amoeba be on the look- 

 out for specimens which are dividing and encysting. When 

 found describe and draw, 



REFERENCES 



Dellinger, 0. P., 1906. Locomotion of Amoeba and Allied Forms. 

 Jour. Exp, Zool, 3:337-358, 



Greenwood, M., 1886-87. On the Digestive Process in Some 

 Rhizopods. Part I. Jour. Physiology 7:253; Part II, 

 Jour. Physiology 8 :263. 



Sehaeffer, A. A., 1920. Amoeboid movement, 156 pp. Princeton 



University. 



Sehaeffer, A. A., 1926. Taxonomy of the Amebas, with descrip- 

 tions of thirty-nine new marine and freshwater species. 

 Carnegie Inst, of Washington, papers from the Dept, of 

 Marine Biol,, 24:1-116. 



