of Frozen Electrolytes at very Low Temperatures. 381 



test (in the maimer described in a former abstract)* another large 

 series of electrolytes. 



Referring to the above-mentioned abstract for an account of the 

 details of the method, we merely give in the following Tables the 

 results of our observations on the dielectric constants of many 

 aqueous solutions of metallic salts, which have been taken with the 

 object of determining if possible the causes which create high or low 

 dielectric values at low temperatures. 



The dielectric observations were all taken at a frequency of electro- 

 motive force reversal of 120. 



We have taken, in the first place, a large series of observations on 

 electrolytes with the same base (sodium), but different acid radicles, 

 -and then a number with the same acid radicle but different bases. 

 Also, we have examined normal and corresponding acid salts, double 

 salts, and many salts taken in such proportion with water as to yield 

 the so-called cryohydrates. 



The following tables give the details of the dielectric measure- 

 ments. 



I. Dielectric Constant of Sodic Acetate (NaC 2 H 3 2 ). 

 (5 per cent, solution.) 

 Corrected galvanometer deflection when the condenser had air as 



Observations. 

 Condenser charged to 19*0 volts. 



Condenser charged to 1*434 volts. 





dielectric 



= 4-02 





Mean 





Temperature 



galvanometer 





ill platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-200-0 



3-00 



3-82 



-200-2 



3-03 



3-85 



-197-6 



320 



4-08 



-181-5 



5-20 



6-70 



— 158-5 



172 



29-80 



-150-8 



2-45 



42-50 



-142-8 



3-05 



52-80 



-113-3 



4-17 



72-00 



-98-8 



5-15 



89-0 ? 



* See Fleming and Dewar, "On the Dielectric Constants of Certain Frozen 

 Electrolytes at and above the Temperature of Liquid Air." ' Roy. Soc. Proc.,' vol. 

 €1, p. 299. 



