New-York tribune., 1876-12-02

book. About 43o appears TO be the most favorable
temperature TO preserve potatoes; IL III exceeds o1
oe ee3 N - part OI 'T aan ont The cause Of
the heating is generally found TO be some decaying
potatoes.
CoRRosroN OF SHEET ZINC, &c.-Frischen, In
spector of Telegraphs, states in n communication to
tho Berlin Polytechnic Society that the destruction
of sheet zinc may often bo referred to iron nails en-
ployed with it. and also to particles of charcoal
falling on TO il, in the neghborhood OF chimneys
owing TO the gavanic action developed For the
same reason copper tubes soldered with zinc require
renewal Of the joints every few ycsrs, and gas and
watcr-pipos become lealy on account OF the lead
employed in joining them. Copper strips, used as
lightning conductors fastened With IRON nalls, cor
rode rapidly and the ends of hghtnlng-rOds en-
bedded IN charcoal, as generally recOmmendet' are
rapidly destroyed in the same way In the eomDina-
ti0n Of east and wrought iron in system of pipes,
decided current of electricity can be detected lnd-
eating that more attention should be pala TO th7
fact I'm layiug them. IL has also been noticed that
zinc couodcs readily in contact with Ilne'
MACHINE FOR IMPREGNATI>G LEATHER WITH
GREAsE-Instead Of the usual primitiyemethods for
impregnatng leather with grease, intended torYarI-
Gus purposes. Frey & Son of Vienna have devised
machine on the following general plan, which Is SAID
10 answer The purpose perfectly. sort Of basket ~
formed Of two vertical circular disks with round
rods showed horizontally through holes in them, and
fixed oonccutric9uy around a horizontal revolving
shaft The shaft can be reyolyeda at viii backward
OF forward. The size Of the basket can be adjusted
to the size of the hide to contain II, by placing
the rods In different sets Of opening, with when the
disks are supplied. The shaft has an alraugel4eut
supplied with screws within the basket for holding
the hide The cd rs of the hide IS showed in between
the rods ane fastened 10 the shaft and the whole -
then well creased, and then Dy thc revoIutou oI it
shaft t Is rolled up on 1t IN the h4sSet ana lueI ny
reversal Of the revolution Uur9led; t:c operation
being repeated until It is uniformly lmplcGnatcd
throughout with the grease
SrREwING POIAsu SALTS ON STABLE MANURE
The adyisablity Of fixing the volatile nirogenous
matter in stable manure is gauorallyrecognized, both
on account of its great fertzng value and because
of its tendency to render the atmosphere of the
stable uuwlolesomc. Gypsum and the like answer
tlo puIlase well, but the salts OF potash possess
superior cxcellencies Suiphunc acid in combina-
tiou with potash, is lust effective for hXnS am
mouia as it is in gypsum, while the potash is Na1-
able addition TO the manure, especially for such
plants 81 require much Of it-as grapevine, bcc;s
potatoes, Sc. A small amount Of manure may
thus be rendered as effective Tor these plants as
much larger quantity under the usual condluous'
The magnesium Suiphate. usually present IN fhe
impure potassium salt. also acts more ehcIfcucaIF
on account of It's GOlublltE, ln LNlng auuion luh
the lime salt. Besides, potash salts ddu,d ~ 'uia
Piled scpaTately--a circumstance Affecting greatly
the efficacy Of fertilizers. If all the manure can
not be- treated with potash salts, 1t rs at least de-
cidedly advisable TO apply them TO portion
RESTORATION or DITEmORATED ALBUMEN.-The
restoration, 10y means Of alkaline treatment of the
solubiity of egg or blood albumeu. which has be
come wholly or partially insoiubie by exposure TO
too high temperature or 10 sunlight or by too pro-
longed keeping, has not proved altogether satisiac-
tory in calico printing Tie aihuwcn is dccompoSed
in the process by e abstraction OF sulphur so that
the resultant product in fact different Substance.
This decomposition Of albumeu by weak al"alics
also mamfests Itself in the dcaaouing of the color,
when basic cronatg OF lead, which has not been
completely freed froa line is employed with even
perfectly fresh albumen. Wagner however, has
succeeded. ~ sort of artificial digestion, in per-
fectly restoring the solubility without njuriously
affecting the substance in its application 10 calico
printing. About . 100 20 CLIO grain, of the dc'c-
riorated aibumeu We're brought into contact with
about 4G2 grains Of calls stomach, washed with
cold water and cat into pieces about o. of aH iuci
square, and distributed through about 81 fluid
ounces of water containing lJ0 grains Of coHcen-
trated hydrocbloric acid, and having q temperature
# 1902. After standing - 90 3G hour, tAr whole
was placed on q sieve, and Che ilQui ppr1Cn. Nh'-
ututIaILrG by ammonia, proved TO Ht su.. SODA ot
alhumeu suitable for technical purposes. The pro-
cess has been employed on large >ca'p. Wiz found
-I,rt fine rucruIrarurIs r of the stomach ot >h.vU
and hogs could De- used TO; the s'Iur purpose. -.
latter being the more effective of the two. lu"
solution obtained is UdoI'ss, fac: oi importance %"
regards blood alDumsn, ana D.. tyAsHt.ta u, -,a"-
udlILltiOn " ttn ammonia "h r'4iAS' e., 81. "'Io-
uul Experiments with ls nave proved De- 10 ~
adapted Tor the production. with u'tuuaul', "i -
blue that Is fast even In boiling SOAP -ptuto Nuch
res oFci aibunCu is, however, GiadG, us-~y.r it"u
the normal by the addition o. actlC ca "a t''.'
80. IT., as 10 remains clear aI becomes Ut 'rt-
'.a frrI. Z G.. flor |I.F d. p