PROTOZOANS 107 



dropper, take some of the water from the above prepara- 

 tions and place it on a glass slide near the middle. Carefully 

 clean a cover glass and put it loosely on the sUde. Change 

 the water on the slide as often as necesary. The specimens 

 may be fed by putting water at the edge of the cover glass 

 and letting it run under the slide by capillary attraction. 



(i) General Examination: Look carefully at the slide 

 with the low power of the microscope and see how many 

 different forms you can find. Notice shape and variations 

 in size. What determines the shape of the body? Is there 

 a distinct head? How are the motions of the body pro- 

 duced ? Do you find blood ? A heart or organ correspond- 

 ing to a heart? Do you find gills? Eyes? Nervous sys- 

 tem? Do you find an alimentary canal or any part of one? 

 Do they seem to choose their food or the path they travel? 

 Is there a protection for the body? Draw four or five dif- 

 ferent forms in a general way showing the outline of the 

 organs studied. 



(2) The Amoeba: This specimen is generally distin- 

 guished by its irregular outline and its uncertain motions. 

 Examine it carefully and note its general outline in the 

 dififerent positions. What is its shape? Is the shape the 

 same in different positions? Do you find pseudopodia 

 (parts of body extended into feet) ? What is the shape of 

 a pseudopodium? How many has a single specimen? 



Make sketches of the animal at different times showing 

 the pseudopodia. 



Distinguish the following parts : 



a. Ectosarc (outer, clear, layer of protoplasm). How 

 much of the body does it form? 



b. Endosarc (inner, granular mass of protoplasm). 



