VIATE 3 



EXPLANATION OF FIGURES 



13 A paramoecium dividing. This animal before division had four vacuoles 

 arranged as in figure 6. A new vacuole has been added to each end. 



14 A conjugating pair of paramoecium. One animal has three and the other 

 two vacuoles. 



15 Drawn from a fixed and stained preparation showing the macronucleus 

 and the single micronucleus. 



16 Drawing made with the aid of an oil immersion lens showing the vacuoles 

 to be surrounded ]:)y a morphological membrane. 



17 A paramoecium dividing. Before division began this animal had five 

 vacuoles arranged as in figure 7. A new vacuole has been added to either end. 



18 A paramoecium with a greatly enlarged vacuole. This condition has 

 been rare in my cultures. Occasionally the animals recover from this condition 

 but more frequently they die with the vacuole still distended. 



19 The mouth of this paramoecium has been forced out under pressure. 



332 



