170 



C. M. CHILD 



stimulation of this same sort, i.e., at intervals of five to ten min- 

 utes, and have not succeeded. Much shorter intervals or prac- 

 tically continuous stimulation are necessary to accomplish this 

 result. Moreover, the actual movement in the KCN is very 

 much less in amount than would occur with the same stimula- 

 tion in water, because the animals become less and less sensitive 

 to stimulation. 



Other similar experiments have without exception given similar 

 results. 



TABLE 2 

 Worms placed in KCN 0.001 m. 11.00 a.m., March 8, 1912 



