fmann),

CS2 + 2NH3 -> NH2.CSS.NH4 -> H2S + NH4CNS.

Carbon bisulphide combines with primary amines to form alkyl
dithiocarbamates, which when heated lose sulphuretted hydrogen and
leave a residue of a dialkyl thio-urea,

CS2+2R.NH2 -> R.NH.CSS.NH3R -> CS(NHR)2 + H2S;

or if the aqueous solution of the dithiocarbamate be boiled with
mercuric chloride or silver nitrate solution, a mustard oil (q.v.) is
formed,

R.NH.CSS.NH3R + HgCl2 -> Hg(R.NH.CSS)2 -> 2RNCS + HgS + H2S.

Carbon bisulphide is used as a solvent for caoutchouc, for extracting
essential oils, as a germicide, and as an insecticide.

_Carbon monosulphide_, CS, is formed when a silent electric discharge
is passed through a mixture of carbon bisulphide vapour and hydrogen
or carbon monoxide (S.M. Losanitsch and M.Z. Jovitschitsch, _Ber.,_
1897, 30. p. 135).

CARBONDALE, a city of Lackawanna county, Pennsylvania, U.S.A., on the
Lackawanna river, 16 m. N.E. of Scranton. Pop. (1890) 10,833; (1900)
13,536, of whom 2553 were foreign-born; (1910 census) 17,040. Carbondale
is served by the Erie, the Delaware & Hudson (which has machine shops
here), and the New York, Ontario & Western railways. The city lies near
the upper end of the Lackawanna valley, and the scenery of the
surrounding mountains makes it a summer resort of some importance. It
has a public library, a small park, an emergency hospital and the
Carbondale city private hospital. Carbondale is situated in one of the
richest anthracite coal regions of the state, and its principal interest
is in coal. Among its manufactures are foundry and machine shop
products, sheet-iron, silk, glass, thermometers and hydrometers, bobbins
and refrigerating machines. The value of the city's factory products
increased from $1,146,181 in 1900 to $2,315,695 in 1905, or 102%. The
settlement of the place began in 1824 with the opening of the coal
mines, and Carbondale was chartered as a city in 1851.

CARBONIC ACID, in chemistry, properly H2CO3, the acid assumed to be
formed when carbon dioxide is dissolved in water; its salts are termed
carbonates. The name is also given to the neutral carbon dioxide from
its power of forming salts with oxides, and on account of the acid
nature of its solution; and, although not systematic, this use is very
common.

CARBONIFEROUS SYSTEM, in geology, the whole of the great series of
stratified rocks and associated volcanic rocks wh