ANIMAL l•:L^:(■TRI(:^^^ 



■LFX'TURE V. 



1 1 1 



and narcotics, and alkaloids, 8:c., should ultimately 

 prove to be a chemical immobilisation of normallv 

 electro-mobile prot(^plasm. I do not, however, wish 

 at this sta^e to pursue the aroument further than 

 may be necessary to convince you that it is the dis- 

 tinct aim of ])hysiolo^ical endeavour to express the 

 "physiological" in terms of the ''physical" and 

 " chemical." 



L. o'ooi volt. R. 



o"i volt 



Fig. 48(2369). — Extra-polar (= "electrotonic") currents of frog's nerve, pro- 

 duced by polarising currents of increasing strength, from o*i to 0'6 volt. At each 

 strength the A. and K. currents are taken twice. Their magnitude may be 

 approximately estimated by reference to the standard deflection of o'ooi volt 

 recorded at the commencement of the observation. 



And it will be part of our immediate task to 

 examine all the accessible electro-physiological phe- 

 nomena of nerve with a view to determine whether 

 or no they are reducible to the somewhat less myste- 

 rious form of electro-physical and chemical phenomena. 



