RESPONSE OF DIGESTIVE ORGANS 



341 



It has been stated that on account of the highly excitable 

 nature of the digestive organ, a single stimulus, if strong, 









FIG. 206. Multiple Response of Pitcher of Nepenthe, in First or Fresh 



Stage, to Single Strong Thermal Shock 

 The constituent responses are both negative and positive, the former being stronger. 



would give rise in it to a multiple series of responses. The 

 two following records (figs. 206 and 207) illustrate this fact 

 in two different speci- 

 mens which were in 

 somewhat different con- 

 ditions. The stimulus 

 employed in each case 

 was a single strong 

 thermal shock, and the 

 multiple responses were 

 found to persist, in both, 

 for quite an hour. In 

 the first of these figures, 

 the constituent responses 

 of the series were both 

 negative and positive, 

 the former being pre- 

 dominant. In the second 

 record (fig. 207) the 

 positive phase is pre- 

 dominant in the responses, and the trend of the base-line down- 

 wards shows increasing positivity of the glandular surface. 



FIG. 207. Multiple Response of Pitcher of 

 Nepenthe, in Third Stage, to Single Strong 

 Thermal Shock 



The constituent responses are here pre- 

 dominantly positive. 



