Cauliflowers, Brussels 6prouts, aspara
gus, and string beans, iu order to re
sume their natural appearance, should
not be pressed. Potatoes are perfectly
preserved in thin slices. Peas and
beans, in a preen stte, are sneceeded
with very well. Lastly, various fruits,
and especially apples and pears, in
slices, are also dried, and keep per
fectly. The Vcxcaxization- of Htdkocabbos
Compounds. In treating bituminous
substances, such as asphaltum, graham-
ite, petroleum residuum, the different
mineral resins, coal tar, etc., with sul
phur, chloride of sulphur, or sulphnr
in combination with various bases, such
as sulphuret of iron, etc., a definite
chemical compound is formed, diflering
from its constituent parts in many ma
terial respects, being harder, tougher,
and more capable of resisting heat. The
sulphur should be in just sufficient
proportion to form this compound, as
an excess would mix mechanicallv with
the mass and render it too brittle for
I use. Difficulty is usually experienced
in determining the proportion of sul
i phnr, as it varies according to the hy
; drocarbon used. To overcome this
difficulty and to avoid all danger of
j having an excess of sulphur, it is best
to use in addition some metallic oxides
I (such as litharge, for example), which
will combine witli any free sulphur.
forming a metallic sulphuret. The
hydrocarbons are first healed till the
water is entirely evaporated, and the
sulphur, chloride of sulphur, or metallic
sulphuret, is then added. The sulphur
may be dissolved in bisulphide of car
bon or anv of the ethereal or fatty oils,
or it may be mixed directly with the
mass.
The Lava Overflow of Oslgos-.
