642 
Proceedings of the Royal Society of Edinburgh. [Sess. 
having the general formula MR0 3 , in which M may be K,Rb,Cs, and R0 3 
may be C10 3 ,Br0 3 ,I0 3 . 
In contrast with the salts of the Ennead of halides, MR, which are very 
soluble, the oxy halides are only sparingly soluble. The determination of 
the specific gravity of the crystals in their mother-liquors is therefore 
much easier, and was effected quite successfully by my assistant, Mr G. 
Fermor. The results so obtained are given in the following table. In the 
first line, T, we have the temperature at which the crystals separated from 
their mother-liquor, and at which their specific gravity, when immersed in 
the same mother-liquor, was determined. In the second line, MRO s , we have 
the formula of the salt In the third line, m, we have the concentration of 
the mother-liquor expressed in terms of the gram-molecule per 1000 grams 
of water. In the fourth line, S, we have the specific gravity of the mother- 
liquor at T referred to that of distilled water at the same temperature as 
unity. In the fifth line, D, we have the specific gravity of the crystals at 
T referred to that of distilled water also at T as unity, and in the sixth line 
MR0 3 
D 
we have the displacement of the crystal per gram -molecule at 
T 
expressed in grams of water having the temperature T. In the eighth line 
Table No. 3. — Giving the Numerical Data relating to the Specific Gravity and 
the Molecular Displacement of the Crystals and the Mother-liquors of the 
Salts of the Ennead MRO s at the Temperature T. 
Temperature . 
T 
14-8° C. 
19-2°. 
18-6°. 
16-2°. 
0 
0 
15-6°. 
16-0°. 
16-0°. 
15-4°. 
Salt . . MR0 3 
KC10 3 . 
KBr0 3 . 
KlOg. 
RbClOg. 
RbBrOg. 
RbTOg. 
CsClOg. 
CsBrOg. 
CsIOg. 
Concentration . 
Specific gravity 
m 
0-5139 
0-4446 
0-4016 
0-2983 
0-1068 
0-1113 
0 2635 
0-0989 
0-0770 
of mother- 
liquor . 
S 
1-0360 
1-0475 
1-0708 
1 0339 
1-0169 
1 0233 
1-0402 
1-0203 
1-0188 
Specific gravity 
4-849 
of crystals 
Molecular dis- 
D 
2-319 
3-221 
3-921 
3-170 
3-680 
4-336 
3-582 
4-109 
placement of 
MR Go 
crystals . 
Molecular dis- 
o 
D 
52-86 
51-88 
54-60 
53-31 
58-00 
60-07 
60-44 
63-52 
63-52 
placement of 
crystals for 
Ennead MR . 
MR 
D 
38-23 
44-46 
54-58 
44-71 
51-55 
61-99 
42-31 
47-82 
57-67 
T\ ' fV» M R< (3 Q 
Difference—^— 3 
MR 
“ D 
14-63 
7-42 
0-02 
8-60 
6-45 
-1-92 
18T3 
15-70 
5-85 
