70 



J. G. MACGEEGOE ON THE DENSITY AND THEEMAL 



carefully determined ; but I did uot consider it necessary, for the purpose for which the 

 experiments were made, to calibrate the instrument. 



The constitution in the case of the weaker solutions was determined by mixing known 

 masses of water and of the crystallized salt. In the case of the stronger solutions it was 

 determined by means of the data furnished by Gerlach's experiments, ■* as given in Landolt 

 and Bornstein's Physikalisch-chemische Tabellen (Berlin, 1883), the density of the given 

 solution, at the temperature of Gerlach's experiments being determined by interpolation 

 from the results of the following tables, and its constitution being then determined by 

 interpolation from Gerlach's resiTlts. 



The following tables give the densities at various temperatures of solutions of different 

 constitution, together with the ratio of the densities of the solutions and of water at the 

 same temperature ; 



I. — Solution containing 0"28 peb cent, of the Crystallized Salt. 



II. — Solution containing 0'89 pee, cent, of the Crystallized Salt. 



'Fres. Zeitschr. f. analyt. Chem., Bd. viii (1869), p. 279. 



