of Organic Bodies^ fyc, at very Loiv Temperatures. 253 



Table I. — Determinations of the Dielectric Constants of certain 

 Liquids at Ordinary Temperatures (15° C.) by Nernst's Method. 

 Frequency = 320. 











Dielectric constant 



Substance. 



is. 



b — S. 



1 bio {p — s). 



- - jj. 



Tf!fViTrlir> o 1 nr^li nl ^ + a Iron 





15-34 



24*8 



25-8 



as the standard of 









(assumed value) 



vj ILL IJcvL 1k>vJ±JL J 













10-49 



9-13 



14-7 



15-7 









(calculated) 





3-98 



2-62 



4-23 



5-23 









(calculated) 



Pure dry ethylic ether 



3-70 



2-34 



3-78 



4-78 

 (calculated) 



Hence by Nernst's method, assuming the dielectric constant of 

 ethylic alcohol to be 25*8, we find that of amyl alcohol to be 15" 7 and 

 pure ethylic ether to be 4*78. 



Nernst himself found amyl alcohol to be 16' and ethylic ether to 

 be 4*25 at about* this temperature. Hence our values are in fair 

 agreement with his. 



In the next place we cooled the experimental condenser down to 

 the temperature —185° 0. in liquid air, after filling it with one of 

 the above six dielectric liquids, and we repeated all the above- 

 described operations again. The results are collected in Table II. 



Table II. — Determinations of the Dielectric Constants of certain 

 Frozen Liquids at the Temperature of Liquid Air by Nernst's 

 Method. Frequency = 320. 



Calculated 









1 -613 x 



dielectric 



Substance. 



S. 



S-*. 



(S-,). 



constant = D. 



Ethylic alcohol .... 



2-68 



1-32 



2-13 



3-13 





2-34 



0-98 



1-58 



2-58 





2-16 



0-80 



1-29 



2-29 



5 per cent, solution 











of Rubidic Hydrate 



2-94 



1-58 



2-55 



3-55 



5 per cent, solution 











of Potassic Hydrate 



515 



3-79 



6-12 



7-12 



The above values for the organic bodies are in close agreement 

 with the results we obtained for the same substances by the galvano- 

 meter and switch method formerly used by us, as may be seen by a 

 reference to Table III. 



