Inductive Capacity and Latent Heat of Vaporization. 125 



and the three other compounds by G. Quincke *. I consider 

 the latter's values obtained by the balance-method to be the 

 most suitable for comparison with Tereschin's figures. The 

 results are given in the following Table : — 



Table VIII. 

 Various Liquids. 



Name and Formula of f 

 Liquid \ 



Ethylic 



Ether. 



C 2 H 5 O.C 2 H 5 . 



Carbon 



tetrachloride. 



CC1 4 . 



Carbon 



disulphide. 

 CS 2 . 



Oil of Tur- 

 pentine. 



C ]0 H 16' 



Latent heat of vapor. (A) . . . 

 Spec. Indue. Capacity (K) ... 



89-9* 

 4-32 



46-2* 

 2-20 



84-8* 

 2-57 



68-7t 

 2-21 



Ratio— 



20-8 



21-0 



33-0 



31-1 



Mean =20-90. 



Mean =3205. 



* Eegnault. 



t Favre and Silbermann. 



It will be seen from the above table that the quotient ^ is 



totally different to that obtained previously, but it is not im- 

 possible that the four bodies may belong to two distinct groups 

 as indicated in the table ; however, before trustworthy con- 

 clusions in this and other directions can be drawn, considerably 

 more experimental data would be required. 



There is no doubt that a better agreement between the two 

 constants could be obtained if the same samples of liquid were 

 used for both determinations on account of the almost un- 

 avoidable presence of foreign bodies, especially of water, which 

 in this case would affect both measurements in the same di- 

 rection. More uniform results might also be expected if the 

 specific induction and latent heat, which are known to vary 

 with the temperature, were determined at the same or corre- 

 sponding temperatures. 



If the present communication should in any way tend to 

 induce others to take up this interesting subject and pursue it 

 in a systematic and exhaustive manner, my object will have 

 been accomplished. 



Woolwich, June 3rd, 1891. 



* Wied. Annal. vol. xix. pp. 705-729 (1883) ; and I. c. vol. xxviii. 

 pp. 529-538 (1886). 



