180 On definite Preportions. 
if we calculate, for example, the composition of the mu- 
riate of lead from that of the sulphate of baryta, of the 
sulphate of the protoxide of lead, and of the muriate of 
pe we have the following proportion : 191°427 : 279= 
281°284 ; 409'96, while the [second] experiment gave 
409°88. 
Baryta. 
Since 281'284 parts of baryta and 425°35 of oxide of 
silver each saturate 100 parts of muriatic acid, they must 
contain equal quantities of oxygen ; whence we have the 
following proportions for baryta: 
Barium.... 89°529 100°000 
Oxygen ... 10°471 11°696 
If we compute from the composition of the sulphate, the 
oxygen of baryta appears to be 10°422 to 10°5 per cent. 
Porass. Muriate of Potass. 
Ten grammes of pure muriate of poiass, dissolved in 
water, afforded, on the addition of nitrate of silver, 19°21 
of fused muriate of the protoxide of silver, containing 
3°65662 gr. of muriatic acid. Hence the muriate of potass 
consists of 
Muriatic acid 36°566 100:0000 
Potass ...... 63°434 173°4766 
Sulphate of Potass. 
Bucholz found that 300 grains of sulphate of potass con- 
tained three grains of water, and afforded with a salt of 
baryta 400 grains of sulphate of baryta. ene sulphate of 
potass consists therefore of 
Sulphuric acid.. 46'214 100000 
POLSE ec co panies «| STOO 116°385 
Potass. 
T have found by direct experiments on the composition 
of potass, that +32 gramme of potassium afford -608 of 
muriate of potass. Now this contains, according to the 
corrected analysis of the muriate of silver, *38568 gr. of 
pure potass ; consequently 32 parts of potassium had taken 
up 6°568 of oxygen. Potass consists therefore of 82°97 
of potassium and 17°03 of oxygen. But if, according to 
the preceding calculation, 173°4766 parts of potass contain 
29'454 of oxygen, this alkali consists of 
Potassium... 83°022 100°000 
Oxygen.... 16°978 2()'450 
Calculating from the sulphate, potass consists of 82°865 of 
potassium 
