PARAMCECIUM. 31 



2. Entoplasm : the more granular, inner portion. 



3. At the base of the vestibule the mouth-open- 



ing leads into a blind pouch, the oesophagus, 

 through whose posterior wall the food 

 passes into the entoplasm. 



4. Food-vacuoles : spherical spaces in the ento- 



plasm containing water and food-particles. 



5. Water-vacuoles. 



6. Contractile vacuoles : one near the anterior and 



the other near the posterior end. (Study 

 carefully, and sketch in two or three stages.) 



7. Nucleus : an oval body near the centre of 



the cell (not always visible in the living 

 state), the macronucleus ; close to this the 

 micronucleus. 

 /Sketch a Paramcecium, much enlarged. 



III. Movements. 



1. Currents in the entoplasm : made evident by 



changes in the position of the food-vacuoles 

 and the water-vacuoles. 



2. Action of the cilia. (To see the currents pro- 



duced by the cilia in the surrounding water 

 introduce under the cover-glass a small quan- 

 tity of powdered carmine. ) 



Make a diagram of the animal, and indicate by 

 means of arrows the course of the currents. 



IV. Reproduction. 



Sketch any specimens you may find dividing by 

 fission or conjugating. 



