ACTINOSPHAERIUM, PARAMECIUM 25 



minute granules when studied with the high power and best 

 light. 



6. If possible, observe the process of catching food with 

 the tips of the pseudopodia and the manner in which it is 

 drawn toward the body. Note any motion on the surface of 

 the body as the food is drawn closer, and also the manner in 

 which the food is finally ingested. Are there any indications 

 that the pseudopodia extend as still finer filaments beyond 

 the point to which it is possible to trace them with the high- 

 est magnification at hand? If the capturing of food is ob- 

 served, make a series of diagrams to illustrate the process. 

 (Minchin, p. 50.) 



If possible, observe a specimen undergoing division. 



Draw. 



It is desirable to examine Clathrulina, noting the stalk 

 and skeleton. Look over figures. 



R. Hertwig: Ueber die Kernteilung, Richtungskorperbildung und Be- 

 fruchtung bei Actinosphaerium. Abt. d. Math. Phys. Kl. d. Ak. d. 

 Wiss., Munchen, 19, 1898. 



INFUSORIA 



PARAMECIUM 



Place a drop of the culture on a slide, cover, and ex- 

 amine with the low power. 



1. In an animal not closely confined note the shape and 

 movements. Is it possible to distinguish an anterior and a 

 posterior end? A forward and backward movement? Is one 

 side of the animal kept constantly uppermost? Is there a 

 dorsal and a ventral surface? Do the animals change their 

 shape either permanently or temporarily? Individuals tend 

 to collect about air bubbles and at the edge of the cover- 

 glass. Why? 



Indicate by a sketch all the points which can be deter- 

 mined with the low power. 



2. Draw off all superfluous water by means of filter paper, 

 add a trace of powdered carmine, and then find a specimen 



