Ou definite Proportions. : 177 
Strver. Sulphuret of Silver. 
a. I obtained, from 2-605 grammes of very pure lami- 
mated silver, which were heated to complete ignition with 
an equal quantity of pure sulphur in a small glass flask, 
2-993 gt. of sulphuret. Consequently 100 parts of silver 
had taken up 14°894 of sulphur. 
i. Treating in the same way 10 gr. of pure filings of 
silver, I obtained 11°49 gr. of sulphuret. The coincidence 
being so complete, any further repetition was unnecessary. 
Consequently the sulphuret of silver consists of 
Sulphur 12-968 14°9 100 00 
Silver.. 87°032 100°0 671714 
Protoxide of Silver. 
Hence we may calculate the composition of the protoxide 
of silver, by comparison with that of the sulphuret and of 
the protoxide of lead. The former consists of 100 parts of 
Jead with 15°42 of sulphur, the latter with 7°7 of oxygen 5 
and 15°42: 7°7=14'9:7°44. Consequently the protoxide 
of silver consists of 
Silver.. 93:075 100°00 1343°86 
Oxygen 67925 744 100°00 
In all probability, however, the quantity of oxygen 1s 
here made a little too great. By other calculations I have 
found that its least possible amount must be 7°3576 per 
cent. instead of 7°44. This uncertainty affects in some 
measure the calculations for the muriates, but not for the 
alkalis and earths. 
Muriate of ihe Protoxide of Silver. 
I have already shown that 100 parts of pure silver afford 
132°7 or 132°75 of muriate of the protoxide. According 
to the first of my former experiments, on which I shal] now 
proceed to calculate, 107°44 parts of protoxide of silver take 
up 2526 of muriatic acid: according to the last, 25°31. 
Consequenily the muriate of the protoxide of silver is thus 
composed : 
Experiment 1. Experiment 2. 
Ne . 
(rd sory c age. 
Muriatic acid.... 19035 100°00 19°066 100-:00 
Protoxide of silver 860°965 425°35 §0'934 42449 
According to the first experiment, 100 parts of muriatic 
acid saturate a quantity of the protoxide of silver, which 
contains 29°454 parts of oxygen; according to the second, 
29'395 only. 
Vol. 42. No. 185. Sept. 1813. M MuRIATE 
