PROTOZOA. 7 



Is there purpose in the movements of the Amoeba ? ^ 

 C. The Body. 



The substance of which the Amoeba's body is com- 

 posed is called protoplasm. The outer portion 

 (ectosarc) is unlike the inner portion (endosarc). 



1. In what respects do the ectosarc and endosarc differ? 



2. Make a sketch to show the relation of the ectosarc 



to the endosarc. 

 How is the ectosarc of advantage to the Amoeba ? 



r>. Feeding. 



1. Do you observe anything in the ectosarc that might 



be particles of food ? In the endosarc ? 



2. Can you find the mouth ? 

 Has the Amoeba a stomach ? 



How does the Amoeba swallow its food ? 



Do you think the Amoeba can distinguish between 



what is food and what is not food ? Why do you 



think so ? 



E. The Vacuole. 



A vacuole is a clear space in the endosarc. Watch 

 it steadily. 



1. Do you notice it disappear and reappear ? 



2. Is this pulsation regular ? 



Can you suggest any function (use) for the vacuole ? 



F. The Amoeba as a Cell. (Dem.) 

 1. Identify, — 



(a) the cjrtoplasm ; 

 (S) the nucleus. 



1 It will be seen that throughout the book unnumbered questions like 

 this cannot be answered entirely by direct observation, but require some 

 exercise of the reasoning powers. 



