On definite Proportions. 99 
\ 
This quantity of baryta contains 6-495, and the water 13-05 
parts of oxygen. But 6495 x 2=12°99. The water of ery- 
stallization in this salt contains therefore twice as much oxygen 
as the base. 
~ Sulphate of lime. From the analysis of crystallized gypsum, 
described by Bucholz, we know that it is composed of the fol- 
lowing parts: 
Sulphuric acid.... 46 
Bimie Woer Sr. se 
Witteretea ee ee 621 
This quantity of lime contains 9:29 of oxygen, and the water 
18°53. Now 9:29x2=18°58. Consequently,the water in this 
salt contains twice as much oxygen as the base, 
Muriate of lime. 1 had collected and put by some years 
ago a quantity of fine crystals of muriate of lime. I pounded 
them quickly, and dried them between many folds of blotting 
paper, several times changed, in a press, until the salt communi- 
cated no more moisture to the paper. I weighed 10 grammes 
ofthe salt thus dried, in a well-stopped glass flask, then heated 
them in the same flask open, and lastly ignited them. The salt 
had lost 49-603 per cent. of its weight. The crystallized muriate 
af lime is therefore thus constituted: 
Muriatic acid .. .. 24°686 
PUNE Sec cera ees eo 7 LL 
WISTS les aes Soe. ; 
Now 49-603 parts of water contain 43°774 of oxygen, and 
25°711 of lime, 7°24 ; and 7:24 x6=43°44. It is easy to see 
that a small excess of water could not here be avoided. Con- 
sequently the water of crystallization contains six times as much 
oxygen as the lime. 
Sulphate of the protoxide of iron. 'Ten grammes of the sul- 
phate of the protoxide of iron were very strongly heated in a glass 
retort, but not raised to a red heat: they lost 45:4 gr. of water. 
This salt consists therefore of 
Sulphurie acid...... 28:9 
Protoxide of iron.... 25°7 
WY ECE ate shaiinis'dieip tare, atthe 
The oxygen of the water amounts to 40-16, and that of the 
protoxide to 5:8; and 5-8 x 7=40-6. Hence we see that the 
water of crystallization of this salt contains seven times as much 
oxygen as the base. 
Sulphate of the protoxide of xine. Ten grammes of this 
salt, being heated over a spirit lamp in a pletina crucible, lost 
36°45 per cent, But since the dry salt consists of 49°52 parts 
G 2 of 
