1910-11.] Specific Gravity and Displacement of Saline Solutions. 643 
of the table we have MR/D, the molecular displacement of the crystals of 
the salts of the Ennead MR ; and in the ninth line we have the difference 
of the displacement of the crystals of corresponding salts of the two 
Enneads. 
The difference in constitution between the salts of MR0 3 and the 
corresponding one of MR is 0 3 , so that the difference of molecular weight 
MR0 3 — MR is constant, and equal to 48. Further, C10 3 = Br + 3*5 and 
Br0 3 = I + l, so that the acid Radicals C10 3 and Br0 3 may be looked on as 
isomers of Br and I respectively. By similar reasoning, I0 3 would fall to 
be the isomer of a possible Ekaiodine, in the spirit of Mendeleeff’s nomen- 
clature. 
Only in one case is the displacement of the halide greater than that of 
the corresponding oxyhalide. The displacement of Rbl is 61 '99 grams, and 
that of RbI0 3 is 60*07. In the corresponding potassium salts there is 
practically equality in the displacements, namely that of KI0 3 , 54*60 grams, 
and that of KI, 54*58. Amongst the chlorates the excess of displacement 
above that of the chloride is greatest, 18*13 grams, in the case of the caesium 
salts ; it is least, 8*59, in that of the rubidium salts, and 14*63 in that of 
the potassium salts. The excess of the displacement of the bromate over 
the bromide is greatest, 15*70 grams, in the caesium salts, 7*42 in the 
potassium salts, and 6*45 in the rubidium salts. We see, then, that the 
increment of displacement of the crystals produced by an addition of 0 3 to 
the molecular weight of the salt is negative for MR = Rbl; it is sensibly 
zero for MR = KI, and rises in the following order of equivalents of 
MR, — Csl, RbBr, KBr, RbCl, KC1, CsBr, the maximum difference, 18*13, 
occurring when MR = CsCl. 
One of the most remarkable results obtained in the research on the 
crystals and the mother-liquors of the salts of the Ennead, MR, was that 
the sum of the displacements of the crystalline salt and of the water 
required to form the saturated solution is greater than that of the resultant 
solution when MR is KC1, KBr, KI, RbCl, RbBr, or Rbl ; and less when 
MR is CsOl, CsBr, or Csl. The excess (dt) of the sum of the displace- 
ments of the constituents over that of the solution is given for each salt of 
the two Enneads in the following table. 
[Table. 
