MULTIPLE AND AUTONOMOUS ELECTRICAL RESPONSE 2OQ 



responses, it will be remembered that the average period of 

 these had also this value. 



These multiple responses to 

 a single strong stimulus, while 

 very strikingly manifested by 

 such plant-tissues as the pul- 

 vinules of Biophytum, and in 

 the animal, by the cardiac 

 tissue, are also exhibited by 

 almost all kinds of tissues 

 under favourable circumstances. 

 In fig. 138 will be seen records 

 which show this in the case 

 of different vegetable organs 

 under diverse forms of stimu- 



. . FIG. 136. Multiple Electro-tactile 



lation. In fig. 139 IS given Response in Stem of Mimosa, 



a series of multiple responses ^mulus Singk Str ng 



which I have obtained from (Original record reduced to .) 



frog's stomach. I have also 



detected the occurrence of multiple responses in nerves of 



animals, which will be described in a later chapter. 



FIG. 137. Photographic Record of Multiple Electrical Response in 

 Leaf of Biophytum 



First series of eight responses to a single thermal stimulus ; second stimulus, 

 after interval of five minutes, evoked five responses ; third stimulus, after 

 second interval of five minutes, gave six responses. Average period of 

 each response, thirty seconds nearly. 



We have seen that multiple response takes place in 

 consequence of some sufficient increase of internal energy. 



