1910-11.] Specific Gravity and Displacement of Saline Solutions. 645 
gives under w the weight of gram-molecule of the salt dissolved in 
1000 grams of water ; under S, the specific gravity of this solution at 19’5° C., 
referred to that of distilled water at the same temperature as unity ; and 
under v, the increment of displacement caused by dissolving y 1 ^ gram- 
molecule of the salt in 1000 grams of water, expressed in grams of distilled 
water having the temperature 19*5° C. 
The solutions are arranged in three groups, each group containing six 
solutions of salts having the same metallic base (K, Rb, Cs). These six 
solutions fall into two groups of three, or triads, the first three being the 
salts having the general formula MR, and the second triad those having 
the general formula MRO s . Each triad is entered in the ascending order 
of the molecular weights of the salts which compose it, and each group of 
three triads forms the Ennead of MR or MR0 3 respectively. 
Table No. 5. — Giving the Specific Gravity, S, at 19°*5, of Solutions of Salts of 
the Double Ennead (MR, MR0 3 ). The Solutions have the General 
Formula 1/16 MR, or 1/16 MR0 3 + 1000 Grams of Water. 
Salt in 
Solution. 
Molecular 
Weight of 
Salt. 
Weight of 
1/16 grm.- 
mol. Salt. 
w. 
Specific Gravity of 
Solution of 1/16 
grm.-mol. Salt in 
1000 grams Water. 
S. 
Increment of Dis- 
placement produced 
by the Dissolution of 
w grams Salt in 
1000 grams Water. 
V. 
KC1 
74*6 
4*6625 
1*002973 
1*684 
KBr 
119*1 
7*4437 
1*005279 
2*153 
KI 
166*1 
10*3812 
1*007588 
2*772 
KC10 3 
122*6 
7*6625 
1*004863 
2*785 
KBrO s 
167*1 
10*4443 
1*007662 
2*761 
kio 3 
214T 
13*3812 
1*011169 
2*189 
RbCl 
121*0 
7*5625 
1*005531 
2*020 
RbBr 
165*5 
10*3437 
1*007868 
2*456 
Rbl 
212*5 
13*2812 
1*010046 
3*203 
RbC10 3 
169*0 
10*5593 
1*007354 
3*183 
RbBrO, 
213*5 
13*3412 
1*010253 
3*057 
RbI0 3 
260*5 
16*2812 
1*013673 
2*576 
CsCl 
168*5 
10*5312 
1*008036 
2*475 
CsBr 
213*0 
13*3125 
1*010409 
2*873 
Csl 
260*0 
16*2500 
1*012529 
3*675 
CsC10 3 
216*5 
13*5312 
1*009825 
3*669 
CsBr0 3 
261*0 
16*3125 
1*012756 
3*511 
CsI0 3 
308*0 
19*2500 
1*016299 
2*903 
[Diagram. 
