64 GENERAL BIOLOGY 



such instances the cilia are like those in the normal stalked 

 form.) 



2. Ciliary Movements. Add powdered carmine to the 

 water and observe the directions of the currents produced 

 and also the method of feeding. Watch the formation of 

 a food vacuole. If there is a movement of these in the body 

 indicate by arrows in a drawing the course taken. 



3. Irritability. Notice what happens when the slide or 

 cover is tapped, and when the animal is touched by some- 

 thing. Is Vorticella more or less sensitive than Paramecium ? 

 Does it always contract when it touches something? Ex- 

 plain. 



4. Reproduction. (a) Fission. Look for individuals un- 

 dergoing fission. Where does the division begin? In what 

 direction does the division take place? After the division 

 is completed one of the two new animals separates from the 

 stalk, swims away and later settles down, forming a new 

 stalk. 



(6) Conjugation. Individuals may rarely be found under- 

 going conjugation. In Vorticella this involves the per- 

 manent union and fusion of a small individual with one of 

 the normal stalked forms. 



Questions on the Protozoa in General. 



Tell something of the shape of protozoa, of their size. Is 

 the body symmetrical? Is the shape constant? Is there 

 any distinction of the animals into regions? What sorts 

 of motions have the animals? How are these movements 

 produced? Do all the protozoa examined have the same 

 motor apparatus? Does the body contain blood and is a 

 heart present? Is there anything corresponding to stomach, 

 lungs, or gills? Do the animals eat, digest food, breathe, 



