New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1873-08-23
APPLIED SCIENCE.


careful stirring produces in from five to ten min
,,es sometimes Immediately, a red solid which,
when treated with acetic acid and filtered; gives q
r,d bouid that yields on evaporation primal
b,sck snbsfauce soluble in acetic acid, ether an,
alcohol Addition of water to its solution III any ~
these produces gray preciPitate'
MANGANESE A SUBSTITUTE FoR NICKEL IN THE
AKIs.-In view of the present high price Oh nioN.'
DR. Percy, the eminent metalurgist' proposes "
substitute manganese for 1t in the preparation "
German silver and maintains that II is ihp"Ssiu'o
for the nost experienoed manipulation to aeterm1e
the difference. except chemically M a., g. tbe
on this subject IN ihe Ghe4 nanrapese sulfcientiy
pure for the purpose, as also ior Ienlne u a
4 there suggested that there is nothing 20 prevsn
pure metal being Obtalneu III 'ais H- ~ "
q comparatively low prlce.
ANurxV-GRrrN WITH STRAw-Straw, IN manu-
factnred or manufactured condition, immorelles'
grasses &C. may be very easily colored with iodine
green As follows: Place the articles in boiling water
for ten 10 fifteen minutes, and allow the whole to
cool; in the meantime, NIX together ten quarts of
water and 40 grains chloride Of lime, and add 45O
grains Of crystallized carbonate Of Soda and then
immerse the straw half an hour in the clear liquid
obtained by allowing 1t to settle Move about the
articles thus bleached in bath Of $50 grains OF
hydrochiorc acid IN ten quarts OF Water i9r rom
by agtating il in bath Of a clear solution OF
iodine green, az about 100, IN wooden vessel ada
ing little picric acid for dyeing yellow.
EXHAUSTION OF GRAIN AND HAY by RAIN.-Ac
cordinp to Knhne, frequent wetting of hay, DC.
should be avoided as much possible, since in time
II maythereby be renderedalmOs worthless as fodder
Two and half pounds of unthreshed oats were
sprinkle with an equal weight Of water, which was
allowed simply 10 filter slowly through into vessel
beneath after which the oats were dried at gentle
III, cd
ounces of a brown liquid were found IN the vessel
The oats lost One-fOreth Of their weight, partly Oy
extraction m the liquid and partly by dfylng;
similar experiments win dry req Sl9teI ; an
meadow grass hay loss of One-tenth It's Weighl
by the former and of One-eighth tor the latter the
GItratiou, however occupying one nour anu H"iA'
CHINESE WATERPROOF VARNIsH FROM BLOOD
Dr. Scherzer an eminent Austrian naturalist dur
ing recent visit 20 China, learned the mode OF pre-
pairing "a waterproof yarnish very extensively used
m that country for coating boxes aud other pack
ages which il is desired to protect against moisture
For this purpose four parts Of blood fresh drawn
are mixed in four parts Of powdered saked lime and
a small quantity Of alum. One, two, or three coats
of this mass which is slightly viscid, Will lmpart so
great degree OF mpemeability to wood to which
II has been applied that II is said 10 be unnecessary
20 nse the Interior tin OF lead lining 20 boxes Tor
Transporting delicate articles through the tropics.
Owing 60 It's cheapness u can he used ior coating
boxes containing sugar cohee TEA ana otheI BUD
stances.
UsEs op PuRPURINE- Purpurine can be employed
for dyeng cotton, wool or silk, of black red.
rose or lilac color Cotton is printed with the usual
madd,r mOrdaut. colorcd. and soaped at l22 10 l44
10 restore the whites and clear the colors. Passing
Though bran improves the whites. Wool IS NOR
danted in alum and tartar. OF bicnlorde OF tin and
tartar, and dyed by boiling half an hour in pur-
puuue bath. A little tannin may be added with adj
vantage to the mordant. For printing wool about
80 grains of purpuriue and 80 grains OF carbonate
of soda are dissolved in hot water, thickened with
starch and increased 20 about one quart, printed,
aud steamed. For crimson. alum and tartar are
used rs mOrdants. silk taxes cOlOrs beautifully,
espeeaIIv reds by mOrdanting with acetate of alu-
nina and chalk. drying, cumming slightly with
trlgarauth solution Ii to POD printing with sOlu-
ton If 4s1 grains purpuriue and 80 Craus crystal
lived carbonate of soda IN water. filtered and thick
eucd with 5000 grams roasted starch, then steamed
and soaped at IA
KEELING Wool N MoIsr CONDITION. The
theory Of many wooldyers that slowing way washed
wool IN d moist condition before dyeing is in many
rascs advantageous or even necessary, and never
injurious seems contrary TO the facts no attention
being paid TO the dsagreeable odor or other changes
produced in H. which ia many are not only ln
furious. hut dangerous. Spontaneous combustion
may occuI especially with greasy wool, and there
fore no more wool OF this kind should be washed
than can be dyed in three 10 four days; and even
with common wool tendency to decomposition is
produced IN that time, and the unpleasant odor
acquired is not easily removed 10y simple washing.
Chrome-dyed wool may even be injured by unequal
penetration of ar into heaps baskesful, unless II
- well cooled and turned after short time. FOR
the ino 81 part however lying for twelve hours is not
injurious 20 mOrdanted WOOL but rather beneficial,
aud when alum and tartar have been used Tor mad
de-dytlnC period of three days rs advisable II II
has beeu well cooled. Brown aud olive darken by
living iu heaps. Wool treated with >uphuric acid
unless washed very soon, becomes brittle ana loses
m color.
Precautions AGAINST CHoLERA.-In lecture on
this subject Prof Forster calls particular attention
10 the eject of wells in spreading cholera and gives
numerous instances not ouly Of different cities but
If different parts oi the city, in which cholera
was endemic where the water supply was from
surface wells willis, 10 did nor prevail where water
was obtained from other sources. or from deep rock
wells he states that IN Dresden the water in one
vel sank when seven feet were pumped ont OF
another 12O feet distant; thar carcasses contanl-
mated the water 100 feet of, and that the ammonia
cal IGuOr of the ga,-works al Munich was de
tected i'm wells 7u0 feet distant In short wells, gen
orally seem TO collect fluid matter from space of at
least 200 feet radius; and since very few are re-
moved that distance from privies they are liable TO
be contaminated hy them. Indeed, chemical
aDalysis shows that weWater ia cities Is rioh ~
nitrates which could only have such source. III
ls plain therefore. why rocky or mpeuetrable clay
soils are not favorable 10 the appearance OF cholera
while tie rapid SINKING Of surface water and poT
QUE soil involve contrary teudcheS 30 tLat chOieIa
NAV continue epidemic even In winter. CbOlela ~
NOT only produced los drinking snCh Wdtci bul mlih,
beer meat a.. treated with 10, become similar
sources 0i the disease
PERSISTENT ACTIyISN oF ABlCHROMAIE IMAGE
According To Marion of Paris announced in Nd'aTe,
If a bichromate photographic image, printed in the
sun he brought into contact with another bichromate
surface IN the dark Simiar impress ion VIII be made