1819.) Mr. Porrett on Sulphuretted Chyazic Acid. 361 
beyond what was expended in the production of gases 5 this must 
have formed water withthe hydrogen of the sulphuretted chy- 
azic acid, and represents 0-038 of a grain of hydrogen. 
The constituents of the 4-8 gr. of sulphuretted chyazate may 
now be easily ascertained in the following manner: 
Grains. Grains. 
(Sulphur. . 1:172 Equal to that in the sul- 
phurous acid and inthe 
| sulphuret of copper, or 
| 0°39 + 0°78. 
27 Carbon .. 0°439 Equal to that in the car- 
bonic acid gas. 
Azote... 0°513 Equal to that in the azote 
as. 
Hydrogen 0-038 Equal to that which com- 
bined with 0°293 oxy- 
gen. 
ff Copper .. 2°345 Equal to that contained 
in the residuum minus 
Protoxide of ‘ay what was contained in 
COpper. .. 6 9-638 "the peroxide first intro- 
| duced, or 11:94—9°6. 
LOxygen. . 0:293 Equal to the whole oxy- 
gen consumed, + that 
left in the residuum, 
— that first introduced 
as a constituent of the 
peroxide, or 1°853 + 
0-84 — 2-4. 
Sulphuretted 
chyazicacid. 2:16 
4-800 ~ 4800 
These results, when stated in atomic proportions, give the 
following numbers, which completely confirm, the former ana- 
lysis. 
¥ (Sulphur .... 40:00 Two atoms 
One atom of sulphur- | Carbon .... 15°08 Two atoms 
etted chyazic acid... 73-94} ADIs oes 094° 17:54 One atom 
| Hydrogen .. 1°32 One atom 
One atom of protoxide Copper. ...- 80:00 One atom 
of copper....+++++> 90-00 a Ge aad ..-» 10:00 One atom 
One atom of sulphuret- 
ted chyazate of copper 163-94 163:°94 
It deserves to be remarked in this experiment, that had the 
whole of the sulphur been converted into sulphurous acid, its 
volume would have exactly equalled that of the carbonic acid, 
and that a concise statement of the whole phenomena of its 
perfect combustion may be made by saying, that an atom of 
