210 SOLUTIONS OF SULPHURIC ACID, ETC.—LINDSAY. 
drew the conclusion that acid or double sulphate was present in 
solution. Also McKay+ has noticed the same for mixtures of 
potassium and magnesium sulphates. 
In the case of more concentrated solutions of CuSO, and 
H,SO,, I have found the same result to hold. But from lack of 
time I was unable to push this far. 
I give two of my measurements, showing the concentration 
and density of the constituents, the density of the mixture, and 
its departure from the mean value. 
| Parts of | Parts of | Denk Sak. | Density are 
He S04 in 100| CuSO, in 100 ensity Density Mean t Differ- 
| ae Soltion. | eee Sor'tion. 2504 ; CuSO4. | Value. Mixture. PASE 
pS TES PC RSMAS EBS eet ee | — 
ial 16.083 1.12586 | 1.19108 | 1.15842 | 1.15603 | .00239 
16.23 | 13.877 1.11525 | 1.14802 | 1.18168 | 1.12952 | .00211 
tTrans. N.S. Inst. Sci., 9, 348, 1897-98. 
