Physics and Chemistry. 91 
The sulphate of lime is still less soluble in sulphuric acid, and 
the solution takes several days to become limpid. Moreover, 
water does not then becloud it; a light precipitate is obtained 
with alcohol. 
The solubility of these sulphates in sulphuric acid, is then the 
reverse of their solubility in water, except for the sulphate of 
Em, which, in both cases, is a mean between those of the 
ther two. 
Nancy, Oct. 20, 1864, 
SCIENTIFIC INTELLIGENCE. 
I, PHYSICS AND CHEMISTRY. 
ment amounted to 1°, when the eye was properly protected, while it 
9 7 . 
reached 14° by direct observation in an ordinary room without exclusion 
is with Soleil’s instrument an uncertainty of +:13°9 gr. in a litre of the 
solution, or rather more than one percent. With Wild’s instrument the 
erro) 
- [Wote—Wild’s Saccharimeter, independently of its purely technical 
oy. 
Pee 
ee ee oy ieantinian 8 Hie de Buci, Paris. 
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