FLAGELLATES, CILIATES, AND OTHER PROTOZOA. 



159 



the water surrounding the cell. Apparently there is slight suction into 

 the broad extremity of the cell, which appears to be closed by a membrane. 

 As dirt and bacteria become entangled in the cilia and appear to be sucked 

 against the membrane, the motility of the former ceases and with a quick 



jerk the organism assumes the position shown in figure 2. The jerk 

 seems to have freed the cilia and the membrane from dirt, the organism 

 slowly moves back to its former position and the cilia resume their 

 motility. 



CONCLUSIONS. 



1. Flagellates and ciliates seem to antagonize each other. The ciliates. 

 when in sufficient numbers, destroy the flagellates. If the flagellates 

 sufficiently outnumber the ciliates, conditions then are unfavorable for 

 the ciliates and they encyst. 



2. The ciliates can without difficulty be cultivated in syxabiosis with 

 bacteria on liquid and on solid culture media. Attempts to secure the 

 ciliates in pure culture have failed thus far. 



3. The ciliates multiply by transverse division of the cell. 



4. Attempts to cultivate the flagellates on solid media were not suc- 

 cessful. 



