LABORATORY GUIDE IN ZOOLOGY 



CHAPTER I 

 BRANCH PROTOZOA: THE ONE-CELLED ANIMALS 



THE AMCEBA 



It is very desirable that good-sized specimens be pro- 

 vided for the study of the Amoeba. Under the high 

 power of the microscope look for a small, granular, nearly 

 transparent object, which changes its outline either con- 

 stantly or at frequent intervals. 



I. — Notice the general nature of the movements. Are 



they slow or fast ? Does the Amoeba always move in a 

 definite direction .' Does it ever happen that different 

 parts of the body move in different directions at the 

 same time.'' Make five outline sketches showing the 

 changes undergone by one Amoeba. 



II. — Study the method by which movement takes place. 

 See that the outer colorless layer of protoplasm — the 

 ectosarc — rolls out into one or more blunt projections, 

 called pseudopodia, or false feet. See whether the inner, 

 more granular protoplasm — the endosarc — is forced 

 into the pseudopods by the lateral pressure of the 

 ectosarc. Observe the changes in the outline of the 

 body due to the movement of the pseudopods. In 



