236 RELATION OF PHYSICAL PROPERTIES OF AQUEOUS SOLUTIONS 



by Grotrian*, who found that, in general, with increasing 

 concentration both of these temperature-coefficients undergo 

 changes in the same sense. Grossmannf claimed to have proved 

 these coefficients to be equal ; but afterwards withdrew the 

 claim as based on an error J. Kohlrausch and Hallwachs also 

 have noticed for very dilute solutions a close similarity between 

 the curves representing the density and the conductivity 

 respectively of the same salt as functions of the concentration. 



The following tables show that this family likeness extends, 

 to a greater or less extent, to all the coefficients for at any 

 rate a considerable number of the properties of solutions. The 

 tables include some of Grotrian 's coefficients with others calcu- 

 lated from the observations of Kohlrausch, Bender, Bruckner, 

 Rother, Rontgen and Schneider^, Fink ||, and Timberg 1F. The 

 coefficients are in almost all cases mean values, the ranges of 

 temperature, &c., to which they apply, though che smallest for 

 which data are available, being not in all cases the same. As I 

 wish to show only a general similarity, it is not necessary to 

 specify the ranges. The temperatures, &c., of the lower limits 

 of the ranges are also not in general exactly the same. The data 

 of the tables are thus not exactly comparable ; but they are 

 sufficiently so for my purpose. The heading n stands for 

 gramme-equivalents per litre. 



* Wied. Ann. viii. (1879) p. 552. 

 t Ibid, xviii. (1883) p. 119. 



J See Kohlrausch, Wied. Ann. xxvi. (1885) p. 224. 

 Wied. Ann. xxix. (1886) p. 194. 

 II Ibid. xxvi. (1885) p, 505. 

 IT Ibid. xxx. (1887) p. 545. 



