344 



J. M. D. OLMSTED 



came feebler and finally (after three minutes) ceased. When 

 the animal was returned to normal sea-water pulsation was not 

 resumed. 



|M KC1 also caused the intestine to contract greatly. No 

 pulsations at all could be detected, nor did it resume pulsation 

 when returned to normal sea-water. 



Temperature 



Fig. 2 Ordinates indicate time, in seconds, for 10 pulsations of excised pieces 

 of intestine of Synaptula; abcissae indicate temperature, centigrade. Different 

 symbols indicate different individuals from which the pieces of intestine were 

 taken. 



