320 Harriey—On the Conditions of Equilibrium of Deliquescent and Hygroscopie Salts. 
In other words, it is a true chemical combination, dependent for its formation 
on the chemical property of the whole molecule of the salt, and not upon that of 
any one or other of its constitutents. 
These results have a practical bearing on the preparation of the crystallized 
compounds, inasmuch as we now know the conditions under which they may be 
produced. 
I cannot omit mentioning that the whole series of observations was made 
in my laboratory by Mr. J. A. Cunningham, 4.R.¢.sc.1., B.A., with conscientious 
care and exactitude. The results were periodically checked by me, while the 
condition of the salts and the temperatures were almost daily under my 
observation. 
