84 ANIMAL ELECTRICITY. LECTURE IV. 



which the term " zincable " is to be understood in 

 the legend of this diagram (fig. 36), which is 

 intended to serve as a memorandum to the polar 

 alterations of excitability and of electromobility effected 

 by the action of the galvanic current. 



hmiL Katholc 



Fig. 36. 

 ' ' Excitability " and ' * Zincability. " 



Less excitable. More excitable. 



Less zincative. More zincative. 



More zincable. Less zincable. 



We may tentatively proceed a step further in the 

 direction of general expression, and — admitting that 

 the grey axis is the essential part of a nerve-fibre — 

 recognise as a possible series of associated facts : — 

 (i) the kathodic excitation of the grey axis; (2) 

 the liberation of electro-positive elements ; (3) the 

 reduction of deoxydisable ''Inogen " (? carbohydrate) ; 

 (4) the evolution of carbonic acid. 



The point mentioned on p. 74, is in some measure 

 confirmatory of this view. The sugar appears in this 

 case to have played the part of an oxygen-giving food, 



