236 Proceedings of Royal Society of Edinburgh. [sess. 
various determinations of these data : e.g. Rudorf * gives a table 
comparing the data for various salt solutions by Abegg,f 
Arrhenius, J and Reyher, § stated to be for 25° ; whereas Reyher’s 
alone are for that temperature, those of Arrhenius were for 
17 *6° C., and those of Abegg apparently for 15° or 16°. It is not 
surprising that the data do not show good agreement. 
The results contained in the above tables show that there is a 
considerable difference between chloride, bromide, and iodide, not 
only at any one temperature and concentration, but especially 
in the effect of variation of temperature and concentration on 
the viscosity. The experiments have, unfortunately, not been 
extended over a sufficient range of temperature and concentration 
* Zeit.f. Phys. Chem., 43, p. 257 (1903). + Ibid ., 11, p. 248 (1893). 
t Ibid., 1, p. 296 (1887). § Ibid., 2, p. 744 (1888). 
