54 



C. M. CHILD. 



tions between which the change in question occurred, and . . . ? 

 indicates that the change or process did not begin until after the 

 close of the experiment. In this species cessation of pulsation, 

 disintegration and in some cases loss of contractility are available 

 as criteria of susceptibility. The jelly is very firm and does not 

 shrink to any great degree in any agent used. 



The three tables agree in showing a greater susceptibility in 

 young than in old animals, as indicated by cessation of rhythmic 

 pulsation, loss of muscular contractility and disintegration. 

 Special attention must be called to certain points. In Table II. 



TABLE II. 



^Equorea: SUSCEPTIBILITY TO KNC. 



it is of interest to note that KNC m/ioooo is about as effective, 

 or in some cases more effective than much higher concentrations, 

 w/5OO, w/2OO, in stopping pulsation. It has been observed in 

 other cases (Child, 'i6a, 'i6b) that rapidity of action of KNC 

 and certain other agents, as indicated by death or other effects, 

 increases only slightly with increase in concentration above a 



