2 5 6 



COMPARATIVE ELECTRO-PHYSIOLOGY 



this to be the case. The responsive current here flowed from 

 the glandular posterior to the non-glandular anterior surface. 

 From this experiment we see that a glandular surface is 

 exceptionally excitable, a conclusion which will be found to 

 be supported by the numerous experiments on glandular 

 organs in general, to be described in Chapter XXIV, I give 

 in fig. 163 a series of photographic records, obtained on 

 excitation of Dillenia indica. In the next record (fig. 164) 

 are seen the responses given by the pitcher of Nepenthe. 



FIG. 163. Photographic Record of Re- 

 sponses of Carpel of Dillenia indica 



Natural current from posterior to an- 

 terior, and responsive current from 

 anterior to posterior surfaces. 



FIG. 164. Photographic Record 

 of Normal Responses given by 

 Pitcher of Nepenthe, under Equi- 

 alternating Electric Shocks 



Responsive current from internal 

 glandular to external non- 

 glandular surface. Note ten- 

 dency to multiple response. 



An interesting fact to be noticed in the latter is the tendency 

 to multiple response. 



Similar results were also obtained on taking any single 

 scale of the bulb of Uriclis lily about the time of flowering. 

 In each of these the lower or outer surface is invested with a 

 more or less dry and glistening membrane, while the upper 

 or concave is moist and glanduloid. The moisture observed 

 inside each scale is in fact exuded from this inner surface. 

 On subjecting one of these scales, then, to the electrical 



