New-York tribune., 1876-09-30
APPLIED SCIENCE.

protecting preSefNeu &C, liOtu Oho dSOOh VA
the air aud fernentiug agencies thin layer OF the
fused mixture is simply poured upon the fruIt ana
allowed TO harden. 1t can be readily removed, and
may be used again for tho same purpose, by melting
ii on q water bath.
ExPtoSo,; OF NITRo-GLYcERINE.-scrgius Kern
Of St. Petersburg has been studying the effect OF
heat upon nitro-gycerine. The sample examined
had n specific gravity Of is, and sOlidifed at A.
centigrade TO a crystalline mass At 1870 it entered
into ebullitlon with separation of orange cOlored
spors at 220o it exploded strongly, at 262o more
violently, aud at 300 tho explosion was very
feeble being accompanied by YeuOwish hape IN
other words, the explosive properties OF the SUD
stance nearly vanished at high temperature
CARBON MONosUIPHIDE-Sidot finds that when
carbon disuphide, inclosed in hermeticslly-sealed
tubes h exposed for about two months to the action
Of sunlight brown fakes of the new monOsulphide,
c. g., are deposited. This substance, dried and
purified, il q chestnut brown, tasteless, OdorleSs
powder of 1.66 specific gravity. 1t is insoluble in
water alcohol tuIpentine, benz1l; boiling ether
carbon dIsulphde dissolve traces OF It, Hot nitric
acid dissolves the monosulphide to red liquid;
but chlOrOhydTic acid Is without action upon IL. A
boiling solution of caustc potash takes it up freely
forming blackish brown liquid, from which acids
reprecipitato the substance. At 2OOS Cent the new
suphide decOmpOses sulphur dlstlllng Oh, ana
carbon remaining behind.
NEW DRYING Ou--The Elaeoooeu PerRicd, or
Tong YeOu, q tree growing in China and Cochin
China, produces abundantly fruit consisting OF a
capsule flied with grains rich in oil. This oil is
easily extracted by pressure has density of O9362S
and possesses a variety of curious properties. Ac-
cOrdng to Cloez, vino has lately submitted 1t to
thorough investigation, it drys more rapidly than
any other known OIL coating of it applied to glass
or clean metallic surfaces becoming dry in very
few hours. An attempt viii probably be made to
acclimatiZe tie plant in Algeria with view toward
rendering it useful in the arts and introducing & ~
into
connected with She oil is it's power OF soldfylng u-
der the action of light and out of contact with the
air. Heated in the air it also becomes SOLID, TINS
change beng, however, q chemical one due TO oXl-
dation
Do ACIDS CoAGUIATE THE BLooDi-M. Gre in
curing whether OF no acids cOagulate the blood has
tried number of curious experiments by means OF
subcutaneous injections On several different occa-
rions he injected into the veins of dog quantities
of dilute aeetic acid, containing from to 20
gTaulnes of the substance itself The treatment
seemed III each case to be wholly innocuouS and no
coagulation occurred Two and half grammes
of sulphure acid diluted with GO of water, injected
into another dog caused brief painting, but no
other peTcephble effect Four days later the crea-
ture was killed, but no traces OF coagqlatlon were
anywhere to be detected in it. Somewhat similar
results were furnished by the IT, elton INTO various
dogs Of nitric, phOsphoric, aud cElorbEdlc aclaS,
and also of alcohol These substances, mingled VITA
blood in free contact with the air all cause coag-
ton but in the veins no such elect Is produced
PHoroGRAPmc CoPYING-PAPER FOR DRAWINGS,
ETC-A very simple French cOpying-paper affords
comics IN white lines on blue ground of drawings
pressed in contact with it by of glass plate,
after 10 minutes exposure TO sunlight. The pie
lures are then Fixed by simply washing them III
water According to analyses by lrof. SchWaTz,
the ground consists of TunbulPs Dne, formed,
doubtless from the action Of ferrcyanide of po-
tassium on ferrous oxalate, formed by the reduc-
ton of ferric oxalate by the light. He recommends
for the preparotion of y similar article floating paper
on a mixture of 100 cubic eentimeters OF solution
of 31.7 g1anmes of red prusSiate of potash III oOo
cubic centimeters Of water, with 300 cubic cent?
meters of solution of ferTc oX9ate, prepared gy s-
urating 94 gTaames OF cTystalizcd oxallo acid with
the precipitate formed by ammonia from ferrle
chloride, and diuting it TO 500 cubic centmetcfs.
Exposure 20 the sunlight under drawing for q
quarter of an hour will afford an Impression, which
may be fixed by washing it in water.
A NEW CLASS or CYANIDEs-G;Iston Bong, study
ing potassum fcrrocyanide and some of its deriva-
tyes has obtained remarkable new double salt.
1t is formed BY treating mixture OF the common
yellow prusSiate and potassium chlQrate with sui
phuic acid until persistent blue color is pro-
duced The resulting mass is heated gently, ex-
tracted with water, neutraEzed with sodium
carbonate, boiled aud filtered. This solution, by
careful capitalization in vacuo yields black crys-
tails which readily soluble in water, give it an IN
tense violet color. The compound may be regarded
Rs the type of an entirely new class OF double
pyanides and its relation to we-known feTro-and
ferricyanides may be indicated by formula
Potassium ferrocyanide. e......-..h2 re Cy3
Potassium ferrlcyamde k3 E Ee2 S6 Sy6
New compound --....-.----;. .h4 fei Cyl2
Thus, in this series every added potassium atom
needs doubling of all the other atoms III the mole
cule. The salt Is q powerful Oxdlztng agent,
and produces greenish pTecpitates with metallic
solutions.
A NEW IcE CALomMETER.-The Ice calOrimeter in
hits forms measures quantities of heat by deter
mining how much ice that heat can melt In Bun
sens apparatus advantage is taken of the change of
volume which ice undergoes upon fusion. This
change occurs at one end of a column of mercury
sustained in capillary tube; as tho les melts the
mercury descends, and the amount of fafl repre-
sents the quantity Of heat. But the use of cap
iary tube in this apparatus affects the delieacy OF
All measurements made with it. So Schiller and V.
Wartha propose Modification of Bunsen's calor-
imeter, IN which graduated scales are done away
with. the amount of mercury involved in any
measurement made with the instrument being de-
terrnined by direct weight. As the ice in the
apparatus nelts and the eelumn Of mercury falls
additional MERCURY flows in through peculiar
suction tube aud the weight thus absorbed AFFORDS
a msasure OF the heat. The details Of the new
calorimeter are rot very complicated but need the
authors diagram fOI their explanation No lnYen-
tors tried TO apply their instrument to deter
mining the specific heat of some metallic tltanlum
and obtained a value apparently too high Seeking
the cause of their they found that the supposed
metal contained nitrogen, being really a compound
OF the formula T. N2.
DEEP WALNUT STAIN FOR LIGHT WooDs.-The
employment of alkaline manganates for staining
light woods in furniture and floors, beautiful, uni
form. and durable walnut brown, is highly recon-
mendsd by Yiedt. The action depends upon the de-