22 



Mr W. N. Shaw, On the relation between [Nov. 25, 



resistance of H 2 S0 4 , until the mass becomes crystalline and then 

 a sudden increase of resistance occurs. The curve representing 

 the variation of resistance with temperature for the mixed chloride 

 and iodide shews similar properties. Moreover Arrhenius has 

 measured the resistance of electrolytes which contain gelatine, and 

 these solidify without producing any sudden change of resistance. 

 Hence clearly resistance and ordinary viscosity are not the same 

 thing. 



Furthermore, in comparing the numerical values of conductivity 

 and fluidity we are met with an obvious contradiction of any such 



Conduc- ) JL, 

 ' tivity 

 ofHg 



2 x lO" 1 



io- 2 



C Gramme 

 12 3 4 5 ^Equivalents 



( per litre. 



generalisation; for on the addition of an acid or a salt to water 

 the viscosity may be increased, whereas the conductivity of the 

 solution depends entirely on the presence of the salt or acid. If 

 the curves shewing the variation of conductivity with concen- 

 tration be compared with those for fluidity and concentration no 

 similarity is conspicuous although there are some striking in- 

 stances, particularly that of sulphuric acid, of concurrence of pecu- 



