New-York tribune., 1874-09-21

thus far been brought into the market Tree from
Durions authorizations, often present In chlccory-
coffee Samples from Berlin IN the form OF coarse
brown powder including yellowsh PARTICLES formed
an adhering slightly gummy mass on being lightly
pressed between the fingers and possessed sweetlsh
bitter taste like caramel and corresponding odor.
Austrian samples. although in the main similar 10
the preceding were slightly more pulverulent, and
of a sourish taste. which fact, together with the
chemical analysis rendered II probable that cneape
inferior perhaps spoiled figs, had been used III
its preparation At its first introduction wondeiiul
medicinal properties were claimed iof II IA Aas.li -
especially in affections of the lungs, Nc anu Nv was
recommended for nervous persons. AithOIgh IL may
be serviceablc in such cases, II can hardy De con-
sidered medicinal, and the Berlin manutactnrer
claims that it is more wholesome than pure coffee
simply because it is less stimulating In all cases
is recommended to employ an equal quanuy oI
coffee with the substitute, ana the coior OF !e pIo
duct is SAID to be exceedingly tne as well as the
flavor.
THE DENSITY OF MOLTEN IRoN.-Mr. Mallet, in
pursuance of his researches in reference to sesmol
oRy and the early geological history of the globe
has made some highly important experiments on the
alleged expansion in volume of various substances
IN cooling down from the liquid to the solid state
Not being able by ordinary methods to determine
the specific gravity in the liquid state of body at
80 high temperature as fused cast iron, Mr. Maliet
has operated by an indirect way. He used conicai
vessel whose contents were very accurately known
by filling it with water and weighing it. This vessel
was flied TO the brim with molten gray cast lron'
additions of molten metal being made 10 Keep inc
vessel flu until il had attained its maximum tem-
perature and maximum capacity. 1he vessei ana
its contents when cold were aglln WeIgneu, afiu f
there were thus obtained the elements necessary ior
determining the specific gravity OF the cast iron
which filled the vessel when In a molten STATE. Inc
result is that whereas the specific gravity OF cast
tvbo is | \ when melted
Cast iron, therefore, Is less dense IN tne lLOeh tn
i'm the solid state. The statements commonly mace
and believed as TO the floating OF IumIS of sod IRON
furnace Stag upon the melted Stag are examined ana
reasons are gwen for believing that even such slags
are not denseT in the molten than III tine soma state
and that the floating referred to Is due 10 oIner
causes.
AUTOGRAPHIC REPRODUCTION OF DRAWINGS OF
MACHINERY. &C.-The process, almost exclusively
employed for the multiplication OF manuscripts, is
suggested by Tally for the reproduction OF drawings
of machinery, sc. A tracing of the drawing Is 1Tst
made in photographic ink by placing II upon several
thicknesses of heavy, very smooth paper upon
drawing board and covering 1t with piece oi OF
dmary tracing paper. previously coated WIN an
emulsion of tapioca IN pure water, ana caieIuiIY
dried free from dust and pasted by its projecting
edges to the drawing board, with the coated surface
uppermost. When perfectly dry the surface is rem
the tracing is made The photographic ink, obtainabe
in solid tOrm is carefully dissolved by moistening 1t
when pulverzed with few drops of rain water ana
rubbing it up with the finger and then bringing 1t to
the consistency of ordinary drawing ink with more
water and allowing it to stand for some time-best
over night. 1t will keep tins condition lor seNela
davs with the addition of water, may be neees-
sarv Care must be taken not to touch the surface
of the paper with the fingers. The tracing is trans,
ferTed to stone by first placing 1t between 19lds OF
damp paper, to soften the taPOca coating ana then
laylng il face down upon photographic stone, and
with moist paper top of it, subJectlng IT TO pres
sure three times in succession; then passing me,
moist sponge over it, and again pressing 1t as before
The paper thus loosened is finally entirely removed
leaving only the paste and tracing ON the stone,
which is next well washed with pure water, then
coated with solution of gum arabic, dried washed
with pure water, treated with acids, mixed, ana
printed from in the usual way atfOrding, II proper
care has been taken, 1000 to 5000 impressions.