New-York tribune., 1873-03-01


obtained by solution of gram ef pdrc geld in aqua
rega, as nearly neutral as possible. in 40 cubic
centimeters pure water and grams eaastio soda in
800 cubic contimetsYs of water PREPARE, as needed
a reducing solution of 2 grams glucose, "a cubic
centimeters water n o0bic centD1eters 20 per cent
alcohol aud 2a cubic centimeters commercial alde-
hyde tsp. gravity S7o). To cover the interior o.
tumbler for example with brilliant film OF go3d'
mt into separate glass volumes of gold soismon'
add volume Of soda solution, and then 1-l6 vciume
Of reducing solution, and pour quickly ihto tne
tpmbler to be gilded enough Of the mixture 10 han
an IL. Keen II in motion for several minutes, 80
that every part may be continually moistened'
DuR.BIE COATING FOR LAMP SHADEs-lhe 1oi-
lowing mixture is suggested by Dr. Sells as coating
esneciolv for lampshades ceilings, &C., prefera-
BILE. in respect to beauty, permanenoe. and cheap
ness TO ordinary oil-paint since It adheres firmly;
remains of brilliant white at high temperatures;
contains no organic matters and by the use of suita
BILE mineral coors have any shade impaired to IT,
Pure zinc white (oxde Of znc thoroughly pulverzed
is added to solution of slicate OF soda OF 4O TO oO
Beaume, until the mixture has the consistency OF
ordinary oipaint The metallic surface to be coated
msst be thoroughly cleansed Zinc and some other
metals must be treated with hydrochloric acd then
washed with water, and the above mixture laid
on several times by of brush, until the sur
face is well covered. 1t will require but short
time between the coatings TO allow the previous one
to dry. Too much of the mixture should not be
made at one time even where large surfaces are to
be covered.
PETROLEUM Ous AMI. CARBOIIc ACTD.-Petroleum,
and the many products derived from 1t are at present
so extensively used that it is of great Importance to
have fixed standard by which to judge their money
value as well as their applicability to the intended
purpose The light oils socalled naphthas, greatly
differ in their degree of volatility; while safety and
efficiency in their manifold applications frequently
depend on this quality. In order to secure con-
sumers against deception, large chemical establish
ment in Brunswick has divided these naphthas into
five classes ranging from specific gravity OF oGo-
O75. and boiling point from l040 to 33S' +. The
quality in every case is guaranteed, and the price
conforms to it. The value of carbolic acid-now so
much in demand as o dsinfectant-depends on the
amount of phenOl contained in it. which is very
variable in different specimens. The same manu-
facturers accurately ascertain the percentage of
phenol in their products, and regulate the prlce
absolutely in proportion, SO that hundred weight
of carbolic acid with 100 per cent OF phenol costs
about Sl2; while the quantity, containing only
20 per cent of pheno is sold for about So So by thus
giving definitely the amount OF the active principle,
the economical and successful of the article is
greatly facilitated and the practice Of demanding
certain price for the mere name of n thing-irre-
spectjve Of its intrinsic value-is done away with
IMITATION or MARBLE.-ImitatiOns of marble
are in great demand for onamentation, and
many different compounds are used for the pur-
pose. Mr.. Pichler, a glider in Vienna, from his
own experience, recommends the following COM
position as being simple aud satisfactory: 4:
Into one pound Of best joiners' glue, boiled
rather thick, half pound of rosln (colophoniuml Is
to be slowly stirred Qnstead of the rosia the same
onantity of Venetian turpentine may be used) Into
this plastic mass is worked mixture of powdered
chalk and of any mineral color Of the desired shade,
aud after the addition of little olive oil IL is ready
FOR moldiug. 1t is sometimes convenient to have the
material in the shape of thin sheets to be eut as re-
qured aud in this case the mass is rolled out upon
a sljgbtly heated plate. Mr.. Pichler asserts that
this composition hardens rapidly, and can be easily
polished. When kept for length of timei should
he wrapped in moist sheet, aud exposed to gentle
heat before using The variegated maTbie-like veins
canaso be produced by kueading together differently
colored portions of this mass.
IMPROVED USE OF STABLE MASURE.-Mr. Won
Horskyfeld, the owner of large landed estates in
Bohemia has since 1854 introduced method of treat
ing the accumulatng stable manure which differs
from the usual process, and for which he claims
many advantages, viz: economy OF time, space,
feed and bedding great saving OF money, and OF
hands, and no necessity for such cOntrivances as
cellars tanks pumps etc. also, far better product,
no loss occurring from evaporation and rot and
finally a decided Improvement in the condition of
the cattle-yards, which never show any trace of
manure, either solid or liquid. Tie says all these
favorable results obtained in the following way
The manure is not removed from the stable until it
reaches the hight of Eve feet the straw for bedding
is cut into lengths of about five inches, and thus
more readily absorbs the liquid portion, and IA
ctates the distribution of the manure in the fur
rows. The entire mass is constantly compressed by
the weight Of the animals, and thereby kept moist
while air and consequent putrefsction are excluded.
After about three months this manure is carried to
the field and Immediately covered in the furrows
where it readily decomp0ses and yields all its
strength TO the SOIL fully double its usual value, ac-
cording TO Mr.. Won Horskyfelds experience. Be-
sides this the air in the stables is tainted by
exhaations injurious to the health of the cattle.
IMPROVEMENTS IN F4IE MANUFACTURE OF SILK
In an account of the progress of silk manufacture
by Alcan the two following items seem of particular
interest:
1t occurred to Alcan to simplify the process for
killing the in the silk cOcoons, by employing
q volatile substance camphor), instead of steam,
which is generally employed in European countries,
at risk of loss by subsequent rottng, &C., unless
the cocoons arc carefully and thoroughly dried.
About 40 pounds of cocooDs were transported
from Southern France to Paris in box in which
small quantity of camphor had been placed and on
the crevices of which paper had been pasted.
Al 4ho francnorfation with the GREATEST
dispatch occurred at a season of the year when the
temperature was favorable to the metamorphosis,
upon opening the box several weeks after its arrival
AT IT'S destination NOT n single butterfly was found: