18 



Mr. C. Chree on the 



one to expect an effect so marked as seems actually to have 

 occurred, and rather suggests that a good deal of evaporation 

 may have taken place. In the more volatile liquids this would 

 naturally occur, and as modifying not only the quantity of fluid 

 but also the surface conditions, would affect the accuracy of 

 the theory- The diminution of the area of the plates and of 

 the distance between them would be too small to introduce 

 any sensible error. 



The following Table gives Weber's results, along with. 

 those given by Lorberg for water, and the values I have 

 obtained by Lorberg's method for glycerine and benzine. In 

 each case Weber's value is that placed first. The temperature 

 is about 4° C. when not otherwise stated. The units are 

 centimetre, gramme, and minute. 





Density. 



h 



Conductivity, 



from 



Weber's 



own figures, 



taking water 



as 100. 



"95 V 3 

 95-4 

 93-7 

 92-7 



92-9 



53-9 



39-2 

 33-6 

 32-6 

 31-6 

 29-5 

 28-2 

 26-8 



1220-7 



Water at 4°1 



1160 



1-134 

 1-272 

 1-362 



1-178 



1*220 



0-795 

 1-271 

 0-728 

 0-911 

 1-485 

 0-818 

 0-701 



' -0745 

 •0831 

 •0857 

 •0911 

 •0710 

 •0711 

 •0698 

 •0691 

 •0776 

 •0692 

 •0809 

 •0402 

 •0430 

 •0433 

 •0292 

 •0250 

 •0243 

 •0235 

 •0220 

 •0210 

 •0200 

 •0235 

 •9094 

 •9250 

 •9720 





Water at 23°6 : 



Corrected by Lorberg 



Sulphate-of-copper solution 







at4°-5 ... 



Last solution at 23° '44 



Salt in water at 4°'4 



„ at 26°-28 



Glycerine at 6°-25 



Corrected by Lorberg's method 

 Glycerine at 25° -2 



Alcohol 



Bisulphide of carbon 



Ether 



Olive-oil 



Chloroform 





Benzine 



Corrected by Lorberg's method 

 Mercury at 4° "5 



Corrected by Lorberg's method 

 Mercury at 17° 



Herr Christiansen* has compared the conductivities of 

 several liquids by means of a comparatively simple piece 

 of apparatus. It consists of three horizontal copper plates 

 separated by glass props. The plates are each 13* 13 centim. 



* Wied Ann. xiv. p. 23. 



