1910-11.] Specific Gravity and Displacement of Saline Solutions. 647 
10 6 (S-1) MR 10 5 (S-1) MR 10 5 (S-1) MR MRO 3 (10 5 S-l) MRO 3 (10 5 S-l) MRO 3 (10 5 S-l) 
The above scheme shows the parallel periodic progression of molecular 
weight of the dissolved salt, and the excess above unity, multiplied by 
10 5 , of the specific gravity of the solution ^ MR + 1000 grams water, 
or T \ MR0 3 + 1000 grams water, at 19*5° C. respectively. 
If we consider the specific gravity of the solutions, we see that in 
each triad it rises with the molecular weight of the^salt dissolved. 
If we consider the increments of displacement (v) produced by the 
dissolution of ^ gram-molecule of each of these salts in 1000 grams 
of water, we see that, for the salts of the same metal, the values 
increase from the chloride to the bromide, and from the bromide to the 
iodide ; and that for the chlorates the values of v are almost identical with 
those for the iodides ; they diminish from the chlorates to the bromates, 
and suffer a considerable fall from the bromates to the iodates. There is 
