Chemistry . 4(U 
curs in a white mass, composed of fine small needles. It melts 
on a hot body, and is converted into very pungent white vapours, 
leaving traces of carbon. It is very soluble in water, and in alco- 
hol. At 50° of Fahrenheit, water dissolves one-third of the 
weight of it It is composed of 
Carbon, 47.5 
Oxygen, 43.5 
Hydrogen, 9. 
With the oxides it forms salts, which differ in their properties 
from the citrates. M. Lassaigne has examined the pyro-citrates 
of potash, lime, barytes, and lead. — Journal de Pharmacies Oc- 
tober 1822. 
23. Combination of Alcohol with Oil of Turpentine. — M« Vau- 
quelin has found, that if 100 parts, in volume, of volatile oil of 
turpentine, and 20 parts of alcohol, are mixed together, they are 
not separable by rest, but form a homogeneous body, an effect 
which arises from a solution of the alcohol in the oil. This com- 
pound does net become turbid by water. — Ann . de Chim. vol. 
xix. p. 279- 
24. New Compound of Iodine , Hydrogen , and Carbon. — M. 
Serullas discovered this compound by dissolving to saturation 
iodine in alcohol of at least 39°- It consists of small pearly 
scales, of a sulphur-yellow colour. It is friable and soft ; it dif- 
fuses, when rubbed, an aromatic odour. It is decomposed at a 
slight elevation of temperature. Water dissolves a very little of 
it, while it is very soluble in alcohol. — Ann. de Chim. vol, xx. 
p. 245. 
25. Hydro-carbo-sitlphuric Acid.— Dr Zeise of Copenhagen 
has discovered a new acid, which has the same relation to sul- 
phuret of carbon, that hydrocyanic acid has to cyanogen. Its 
compounds have been called Hydro-car bo-sulphates. This new 
acid may be procured by pouring a mixture of four parts of sul- 
phuric acid, and three of water, on the salt of potash, and add- 
ing much water in a few seconds. The acid collects at the bot- 
tom, in a transparent slightly coloured oil, which must be freed 
from sulphuric acid by washing. Its taste is acid and astrin- 
gent. It reddens litmus paper. It burns readily, giving out sul- 
phureous fumes. Its odour differs from that of sulphuret of car- 
VOL. VIII. NO. 16. APRIL 1823, c c 
