SCHLUNDT — DIELECTRIC CONSTANTS OP PURE SOLVENTS. 377 



the general rule. Tereschin 1 first pointed out this fact in con- 

 nection with the values he obtained for the dielectric constants 

 of a number of homologous esters of the aliphatic acids and 

 of benzoic acids. The values obtained by Tomaszewski, 2 

 however, for the dielectric constants of the homologues of 

 benzene, show that their dielectric constants increase with in- 

 crease of molecular weight. The dielectric constants of 

 the homologues of benzene and a number of aliphatic hy- 

 drocarbons have been determined by Landolt and Jahn, 3 

 by Nernst, 4 and by others. Some of these results are given 

 in the following table: The second column indicates the 

 values of the dielectric constants obtained by Tomaszewski, 

 the third column the values obtained by Landolt and Jahn, 

 while the last column gives the values obtained by Nernst. 



Table V. 



Substance. 



Benzene 



Toluene 



Xylene (ortho) 

 Xylene (meta) . 

 Xylene (para) . 



Mesitylene 



Pseudocymene . 

 Cymene 



Benzene 



Toluene 



Ethy lbenzene 



Propylbenzene 



Iso-propylbenzene . 

 Iso-butylbenzene . . 



D. C. (Tomaszewski) 



2.218 

 2.303 



2.383 



2.442 



2.218 

 2.303 



D. C (L.&J.) 



Hexane. 

 Octane . . 

 Decane. 



2.222 



2.387 



2.583 



2.35 



2.245 



2.30 



2.417 



2.231 



2.222 



2.387 

 2.414 

 2.351 

 2.376 

 2.341 



1.854 

 1.938 

 1.964 



D. C. (Nernst). 



2.255 

 2.355 

 2.567 

 2.372 

 2.251 



2.415 

 2.249 



2.255 

 2.355 

 2.424 

 2.380 

 2.368 

 2.347 



1.88 

 1.949 



i Wied. Ann. 36, p. 801, (1889). 

 * Wied. Ann. 33, p. 41, (1888). 



J Zeit. phys. Chem. 10, 239, (IM1>- 

 4 Zeit. phys. Chem. 14, 622, (1894) 



