On definite Proportions. : 179 
protoxide of lead consists, according to these experi- 
ments, of 
Experiment 1. Experiment 2. 
Pree 
cai aya —y Sy wy 
Muriatic acid... 19.644 100°00 196124 100°00 
Protoxide of lead 80°356 40906 80°3876 409°88 
These results show, that the two analyses, on which the 
calculation is grounded, approach near to the true propor- 
tions, but do not perfectly coincide with them. It appears 
that 100 parts of the muriatic acid took up as much of the 
protoxide of lead as contained 29°3062 parts of oxygens 
so that here is a small variation from the quantity of oxy- 
gen found in the oxide of silver; but the difference, in 
comparison with the usual accuracy of analytical determi- 
nations, is of little importance. 
Several attempts to drive off the muriatic acid of the 
muriate of the protoxide in a platina crucible, by means of 
‘concentrated or diluted sulphuric acid, with the assistance 
of heat, produced, without exception, only a partial de- 
‘composition. ‘ 
BaryTa. Muriate of Baryta. 
Tn my former investigations { had found that 10 grammes 
of carbonate of baryta afforded 10°46 of muriate, and that 
these formed with nitrate of silver 14°55 of muriate of the 
protoxide of silver. Hence the muriate of baryta consists 
of » Muniatic acid 26-2272 100°C0 
Baryta.,...  73°7728 281°284 
Carbonate of Baryta. 
Since 10 grammes of carbonate of baryta contain as 
much earth as 10°56 of muriate, it must consist of 
Carbonic acid 22:096 100°00 
Baryta...... 77°904 gaeay 
Sulphate of Baryta. 
According to the experiments of Bucholz, 84 parts of 
ignited muriate of baryta afford 94:5 of sulphate: hence 
this salt should consist of 34:424 of acid and 65-576 of 
baryta :* according to mine, 100 parts of carbonate of baryta 
afford 1156 to 118°9 of sulphate; consequently the sul- 
phate of baryta consists of 
. 
Experiment 1. Experiment 2, 
SLE es ete tgs se dig as SERS HITS 
Sulphuric acid 34°314 100°000 34°48 100 
Baryta ...... 65°686  191°427 65°52 190 
If there is any essential error in these determinations, it 
must at Icast affect them all in the same proportion, For, 
M2 if 
