DENSITY OF SOLUTIONS — MORRISON. 



133 



These corrected results agree much more closely with Nicol's* 

 observation, which gave 1.04123 as the density at 20° C. of a so- 

 lution, containing 4.1434 per cent, of the anhydrous salt, than 

 the erroneous results formerly published. Graphical treatment 

 of the above results gives 1.0418 as the density of Nicol's solu- 

 tion. They agree much less closely with Wagner'sf result, which 

 gave 1.0860 as the specific gravity of a solution containing 

 7.239 per cent, of salt. This observation was made at the tem- 

 perature of the laboratory, which is not given in his paper. The 

 temperature of the water to which his specific gravities are re- 

 ferred is also not given, If we assume that the temperature of 

 the laboratory was 15° C, and that the specific gravity given by 

 him is referred to water at the same temperature, and if we 

 further assume that the thermal expansion of the solution under 

 consideration is practically the same as that of water, we find for 

 the density (in grammes per cubic centimetre) of this solution at 

 20° C, the value 1.0841, My observations treated graphically 

 give 1.0755 as the density of this solutiou. Probably, therefore, 

 the above assumptions made in calculating Wagner's density are 

 not correct. 



* Phil. Mag., Ser. 5, Vol. XVI (1883) p. 122. 

 t Wied. Ann., Bd. XVIII (1883) p. 269. 



