AM(EBA. 133 



the endosarc closely and see if the granules change their 

 relative position. In the endosarc make out food vacuoles 

 containing substances (differing in color) which have been 

 taken in as food. Frequently the food particles are sur- 

 rounded by a space filled with a clear fluid. Also make 

 out, if possible, the contractile vacuole, clear and pale pink 

 in color, which quickly contracts and more slowly reforms 

 itself. Time the contractions. 



Watch the animal as it moves on the slide. Make out 

 the way in which it travels. Draw the animal in outline 

 when moving, at two-minute intervals. Jar the slide. 

 Does the animal respond, and if so, how? 



Place a drop of 1% acetic acid at one side of the cover- 

 glass and a bit of blotting- or filter-paper at the other, 

 thus drawing the acid under the cover and over the amoeba. 

 What changes take place in the animal? Notice that 

 this brings out a somewhat spherical body, the nucleus, 

 in the interior. Examine other living specimens and see 

 if you can recognize the nucleus in them. Draw an 

 Amoeba, inserting all the features you have made out, 

 labelling all the parts. 



