THE FLOWER LESS PLANTS. 49 



they are seen to surround food particles. Particles of 

 powdered carmine may be introduced to serve as food. 

 Observe also, if possible,, the rejection of refuse particles 

 from the body. These observations may require patient 

 and continued watching, but will well repay a little effort. 



4. Find Amoebie which show contractile vacuoles. 

 These are clear spots which may be seen suddenly to 

 contract and then slowly to expand. It is believed that 

 the contractile vacuole is an organ for the excretion of the 

 liquid waste products. Euglense and Paramoecia also 

 have contractile vacuoles. 



5. The lack of cellulose in the cell wall, the taking of 

 somewhat highly organized foods, the manner in which 

 these foods are taken and the method by which the refuse 

 is expelled from the body, the possession of contractile 

 vacuoles, and the character of the movements place 

 Amoeba among .the animals. It is the lowest form of 

 animal life, and in observing it the pupil will obtain a 

 very good idea of the appearance of simple protoplasm, 

 which is believed to be essentially the same wherever 

 it occurs, whether in plants or in animals. 



CLARK'S BOX. 4 



