AMCEBOID AND CILIARY MOVEMENT 



3 



3. Effect of temperature on ciliary movement. Fasten with, pins two pieces 

 of thread about half an inch apart across the above preparation of oasophagus, 

 and slightly raised above it. Rinse the membrane with ice-cold Ringer solution. 

 Drop a grain of charcoal on the buccal end, and with a watch record the number of 

 seconds which the charcoal takes to pass over the half-inch between the threads. 

 Again rinse the membrane, but this time with warm Ringer (25 C.), and repeat 

 the experiment. Note the difference in time taken to traverse the space marked 

 off by the threads. Lastly, rinse with Ringer heated to 50 C., and repeat the 

 experiment. The ciliated cells are killed at this temperature, and the charcoal 

 is no longer carried along. 



' 





