CYCLIC MOLECULAR VARIATION 



633 



responding substances were elementary, and the experimental 

 arrangements offered no possibility 

 of chemical reaction, it follows that 

 similar responses, in other cases like- 

 wise, are determined, not by some 

 antecedent chemical, but by molecular 

 action, though chemical action may 

 take place as a consequence of their 

 responsive molecular derangement. 



In the first of the series of records 

 in vertical columns (fig. 392) we 

 have : (a) a mechanical record of 

 abnormal response by expansion, 



FIG. 391. Photographic Record of Enhancement 

 of Magnetic Response after Tetanisation 



passing into normal response by: con- 

 traction, after intervening tetanisation, 

 in frog's nerve. In () we observe a 

 similar transformation, as seen in the 

 electro-motive response of frog's nerve. 

 The abnormal response by galvano- 

 metric positivity is here converted by 

 tetanisation into, the normal negative. 

 Turning next to inorganic substances, 

 and taking the method of Resistivity 

 Variation, we find in (c] the abnormal 

 positive response of tungsten converted 

 by tetanisation into normal negative. 

 Finally (d) where the specimen is tin 

 wire, and the record made by electro- 



FIG. 392. Vertical Series of 

 Records showing Trans- 

 formation of Abnormal 

 into Normal Response 

 after Tetanisation in 

 Living and Inorganic 

 alike in the A phase 



0, Mechanical response of 

 frog's nerve to electric 

 stimulation ; 6, Electro- 

 motive response of frog's 

 nerve to thermal stimu- 

 lation ; c, Response by 

 resistivity variation in 

 tungsten to electric radia- 

 tion ; ^ct, Electro-motive 

 response of tin wire to 

 mechanical stimulation. 



