PARAMOECIUM. 



63. Feeding Experiment. Make a fresh preparation of Paramcecium. first mixing 

 a drop of Indian ink with the water. Watch the ingestion of ink particles. 



64. Contractile Vacuoles. Put a drop of water containing living Paramojcia on a 

 slide, add a few fibres of cotton wool, and cover. Select a stationary individual and watch 

 carefully the emptying and refilling of a contractile vacuole, noticing the radial channels. 

 Count the number of times the vacuoie empties each minute. Then irrigate with 2 per 

 cent NaCl and again count the number of contractions per minute. 



