16 Dr. Inglis’s Extracts fiom his Prize Essay on Iodine. 
carbon, hydrogen, and iodine. I have not examined its pro- 
perties further, but from its peculiar odour have called it the 
foetid hydrocarburet of iodine. * * * * 
The compound of sulphur and iodine formed by Gay- 
Lussac is most likely merely a mechanical mixture, for after 
keeping it in alcohol in a closed vessel for several months, the 
alcohol became saturated with iodine, and the sulphur re- 
mained unaltered. I tried to procure a chemical compound 
in the same way as the chloride of sulphur is formed, but a 
similar one to the last resulted. I caused hydriodic acid to 
come in contact with the chloride of sulphur; instant reaction 
took place,” muriatic acid was formed, and a dark compound, 
which was probably an iodide of sulphur, presented itself. 
Other means may be had recourse to, as 
Hydrosulphuret)) Hyd. Muriat. 
ofiodine = { Sulp. acid. 
and Tod. Iod. of 
chlorine = J Chlo. sulp. 
or, by the action of chloride of iodine. on sulphuretted hy- 
drogen, there would result, either muriatic acid and iodide 
of sulphur, or chloride of sulphur and hydriodic acid. 
Having formed the sesquiodide of phosphorus, I laid it 
aside in a well-stoppered bottle; it, however, in a short time 
attracted moisture from the air, and on removing the stopper 
much condensed hydriodic acid burst forth. To get rid of the 
fumes, I added a small portion of water, and laid it aside; on 
examining it again I found a yellow powder at the bottom of 
the fluid. I added now a little more water; but whenever the 
red powder came in contact with it, instant decomposition 
took place, and much gas was evolved with brisk effervescence, 
After the disengagement of the gas had ceased, there still re- 
mained a red powder, which being dried and exposed to a 
moist atmosphere did not attract moisture; therefore it is 
not any of the former iodides. It bears a considerable heat 
without change; if, however, it be continued and agitated, it 
bursts into flame, and burns with the characteristic appearance 
of phosphorus. It is most probably an oxide of phosphorus, 
but differs from the following in being darker in colour and 
much less inflammable. The oxide of phosphorus, which the 
former resembles, is conveniently formed by placing phos- 
phorus in a long glass tube, and then heating the tube until the 
phosphorus catches fire and liquefies. A current of air is now 
made to pass through the tube by blowing forcibly into one 
end, vivid combustion ensues, and the whole interior of the 
