﻿274 Dr. Paalzow on the Galvanic Resistance of Liquids. 



mixed with many other proportions of water (in which I have 

 had the kind aid of M. Patry of Geneva), I only give the present 

 numbers, as I intend to repeat and extend the observations at 

 constant temperatures. 



In reference to the resistance of the mixture of two liquids, 

 assuming that the liquids do not act chemically upon one another, 

 we may either expect the arithmetical mean, or, if the current 

 traverses both liquids separately and therefore divides between 

 them, we may have 



w— a. 



m 



where W is the resistance of the mixture, R the resistance of one 

 liquid, m a number which expresses how much greater is the 

 resistance of the second liquid over that of the first, assuming 

 that equal volumes have been taken of both liquids. If, as for 

 example in the case of sulphuric acid and water, m is very large, 

 the resistance of the mixture can at most be double the resist- 

 ance of the best conductor. 



The experiments agree with neither supposition. I mixed, of 

 the liquids to be investigated, first those which were dissolved in 

 equal equivalents of water, and obtained the following results : — 



ZnSO 4 +50H 2 O 

 CuSO 4 +50H 2 O 



ZnSO 4 4-50 IPO 

 H 2 SO 4 +50H 2 O 



CuSO 4 +50H 2 O 

 H 2 SO 4 +50H 2 O 



ZnS0 4 +23IPO 

 CuS0 4 +55H 2 



ZnS0 4 + 23 IPO 

 CuSO 4 +105H 2 O 



Resistance 



of the 



individual 



liquids. 



232600 

 213832 



232600 

 25775 



213832 

 25775 



194400 

 225254 



194400 

 339341 



Arithmeti- 

 cal mean. 



223216 

 129187 

 119803 

 209827 

 266870 



W= 



2R 



1 + — 

 m 



222840 



46300 



45900 



208700 



247200 



Observed. 



193920 



64800 



63460 



192430 



199620 



The numbers, which might have been somewhat (but not 

 much) different if they had been observed at constant tempera- 

 tures, show that the resistance of mixtures of two liquids is 

 nearer that of the best conductor. 



With reference to the connexion between the conduction of 



