Dr. Inglis’s Extracts from his Prize Essay on Iodine. 15 
to be spoken of immediately, results. The sulphuric and mu- 
riatic acids have no action with the dark fluid, whilst they cause 
the decomposition of the red, precipitating its iodine. There 
can be little doubt that these two fluids are different com- 
pounds, but a limited period prevented any further inquiry. 
The next compound to be spoken of is a solid hydrocar- 
buret of iodine, sometimes of a dark blackish colour, at other 
times, and oftener, of a decided green. It has never been no- 
ticed by any chemical author, and differs from Faraday’s in 
the following particulars. His is transparent, in white acicular 
crystals, shooting out from the sides of the flask, and formed, 
as I noticed before, in a very few hours after olefiant gas is 
brought in contact with iodine; of a sweet taste, and aromatic 
smell]: it fuses and sublimes unchanged. Insoluble in water, 
acids, and alkalies; soluble in ether and alcohol, and may be 
crystallized from them. 
This new hydrocarburet is opake, of a dark green colour, 
and not of crystalline texture ; is formed after a longer action 
of olefiant gas on iodine; is destitute of taste and smell: it 
fuses and is decomposed, giving rise to another new com- 
pound, hereafter to be noticed ; and lastly, is insoluble in both 
ether and alcohol. Mr. Kemp was the first to discover this 
compound, but he has never examined its properties. When 
it is first removed from the flask in which it has been formed, 
itis mixed with a large portion of Faraday’s hydrocarburet, and 
also with the fluids already noticed: these last are allowed - 
to drip from it, and then on boiling with alcohol the whole 
of Faraday’s hydrocarburet is taken up, and the green com- 
pound remains behind, which, after repeated washings with 
alcohol, may be considered pure. The former sinks in sul- 
phuric acid, whilst the green floats on its surface, and both 
are alike unacted on by it. It burns with a clear flame by 
heat ; it emits olefiant gas and hydriodic acid, and there re- 
mains behind a carbonaceous residue. 
At first, from the negative qualities of this green hydrocar- 
buret of iodine, I thought it was merely carbon; but I soon 
altered my opinion, for I found that by placing this in a 
small tube retort, I obtained a perfectly new compound by 
distillation. I was led to this process by observing that when 
the green hydrocarburet was heated, dense brown fumes 
escaped, which emitted the odour of garlic. A receiver was 
therefore adapted to the retort, and being kept cool, a liquid 
of a deep reddish brown colour collected in it. Whenever 
the stopper is removed from the bottle in which it is con- 
tained, the room is soon filled with the smell of assafoetida. 
It is, like the former, highly inflammable, and consists also of 
