[barnks] resistance OF A HYDRATED ELECTROLYTE 



33 



111 the column under w we give the concentration in grammes per 

 cubic centimetre. These values are obtained by comparison with the 

 table of values in the original paper by one of us with Mr. A. P. Scott.^ 

 They correspond to a slightly lower temiperature, but that will not 

 alter the relative values which we are concerned with. In the last 

 column we give the difference between a theoretical density, calculated 

 by adding iv to the weight of a cubic centimetre of water, and the real 

 density observed. This gives the weight of water displaced by the salt. 

 The next to last column contains the deviations from a theoretical 



formula assuming that one molecule of salt displaces two molecules 

 of water. This holds very closely over a considerable range, but for 

 stronger solutions more water is displaced by the added salt. By 

 plotting this column with the density we obtain the curve given in 

 figure 2. This illustrates the change in the density curve very well, 

 and suggests some change in relation between the salt and water mole- 

 pule. We plot on the same diagram the resistance with the density. 

 The regularity of this curve shows that no change in dissociation, 

 in so far as it would be shown by a change in the conductivity, can 

 account for the discontinuity. 



^ Jour. Phys. Chein., 2, 536 C1898). 



Sec. IIL, 1903. 3. 



