360 Mr. Porrett on Sulphuretted Chyaxic Acid. [May, 
was heated by the flame of a spirit lamp, the gas produced was 
received over mercury, it measured 6°34 cubic inches at mean 
temperature and pressure, and on analysis I found it composed 
as follows : 
Cubic inches, Volumes. Grains. 
Carbonic acid... 3°46 1.1... 2 oc... 1611 $044 carbon 
1-17 oxygen 
AZOLE» tals Haiole s DS Lu Je' cape dha sO bale cepa, POs 
: 0:39 sulph 
Sulphurous acid 1:15 ...... got i788 $039 aa 
6°34 
The residuum in the glass tube was a mixture of sulphuret of 
copper, protoxide of copper, and metallic copper; it weighed 
13°56 gr. I heated it in diluted sulphuric acid, which decom- 
posed the protoxide, reduced half of it to the metallic state, and 
converted the remaining half into peroxide, which it dissolved. 
The copper in the metallic state was dissolved by weak nitric 
acid in the cold, and the sulphuret remained unacted upon: by 
these means I ascertained that the residuum was composed of 
the following ingredients : 
Grains, 
Protoxide of copper ........ 7-56 5872 aes 
Copper. LE, SERS Sige lo eer eeeeor a1) ve 
Sulphuret of copper ...... S390 ois we 
13-56 
Previously to drawing the proper inferences from these data, 
it will be convenient to estimate the quantity of oxygen con- 
sumed, and also that contained in the produced gases. 
Oxygen 
grains, 
Contained in the 12 gr. of peroxide ........ ase ayae eee 2-400 
Contained in the protoxide of the 4°8 gr. of sulphuretted 
PURGE REE ayo) Sie. ale tare Wien ola ad ME oe ee dle »- 0:293 
First introduced in the tube. ..........00eeeee008 wees 2693 
_ Remained in the tube in 7:56 gr. of protoxide.......... 0°840 
Total oxygen consumed...... vee kie eh vie oat whatat elas 1:85) 
In 1:61] gtxof carbonic eid.) 60. ess canna Sewage bear 
In 0°781 gr. of sulphurous acid...........00+. patties ep (ONOO 
Total oxygen expended in the formation of gas......... 1560 
Deducting 1-560 from 1-853, it appears that 0-293 of azrain 
of oxygen (equal to + of that in the carbonic acid) was conamed 
