SCHLUNDT — DIELECTRIC CONSTANTS OP PURE SOLVENTS. 371 



Thionyl chloride (SOCI 2 ). — The sample used for the meas- 

 urements was prepared in the usual way, namely, by the 

 reaction of dry PCI, with dry S0 2 . [PC1 5 + S0 2 = POCl 3 + 

 SOCl 2 ]. About 150g of PC1 5 was placed in a retort connected 

 with a reflux condenser and a stream of S0 2 was conducted 

 in till the PC1 3 had become liquefied ; another portion of PC1 5 

 was then added, and the stream of S0 2 was continued. The 

 liquid thus obtained was heated for some time, with the return 

 condenser still attached, to free it from S0 2 ; and finally, by re- 

 peated fractional distillation a sample of SOCL was obtained 

 which had a constant boiling point cf 76.8° under a pressure of 

 751.3 mm. The value found for its D. C. is 9.05 at 22° C. 

 Slight absorption was observed. 



Liquid Sulphur Dioxide. — A sample of liquid sulphur di- 

 oxide was measured in a sealed cell. The value found for its 

 D. C. at 22° is 12.35. Linde, 1 by Nernst's method, found the 

 value 14.8 at 23°, while Coolidge 2 found the value 13.75 at 

 14.5.° I made but one determination. 



Bromine. — The sample of bromine used for the measurements 

 was prepared by Miss Winifred Titus from potassium bromide, 

 potassium bromate, and sulphuric acid according to the method 

 of J. S. Stas. 3 The value 3.18 was obtained for its D. C. at 

 23° C. The measurements were made soOn after the bromine 

 had been introduced into the cell, so as to minimize the action of 

 the bromine on the platinum plates. 



Iodine. — Pure resublimed iodine obtained from the chemical 

 works of de ITaen at List near Hannover was once more sub- 

 limed by Prof. Kahlenberg. An attempt was made to determine 

 its D. C. in the solid and the liquid states in a sealed cell. With 

 the solid sample the position for maximum resonance was still 

 fairly well defined, but after removing the iodine from the cell 

 it was found, that the plates of the condenser were covered with 

 a black coating, which doubtless introduced an error. Hence 



1 Wied. Ann. 56, 516. (1805). 



2 Wied. Ann. 69, 130. (1899). 



3 Unters. iiber Proport. u. Atomg. Leipzig, 18S7, p. 220. See also Fehling's Handworter- 

 buch d. Chemie. I, p. 235, 



3 



