630 



COMPARATIVE ELECTRO-PHYSIOLOGY 



response is enhanced, after an intervening tetanisation, in 

 a specimen of tin wire. 



We pass next to the third mode of record, that, namely, 

 by the Conductivity or Resistivity Variation. A selenium 



FIG. 387. Photographic Record of Abnormal Response of Selenium Cell 

 converted into Normal after Tetanisation 



Stimulus applied was high frequency electric shocks. 



cell I find to be sometimes in a certain molecular condition 

 in which it will respond to high frequency equi-alternating 



FIG." 



Photographic Record showing Moderate Normal Response of 

 Selenium enhanced after Tetanisation 

 Stimulus applied was light. 



electrical shocks, of the order of a million times per second, 

 by an increase of resistance. Tetanisation is found to induce 

 a transformation, attended by a diminution, or negative 

 variation, of resistance. After this, the responses are found 



