The Democratic advocate. [volume] (Westminster, Md.) 1865-1972, 1874-01-17

iron are placed in tanks, into which these
are collected; the copper quickly inerusts
tho iron, and ID process Of time entirely
dissolyes Il, 50 that a mass Of copper takes
the place Of the iron. The residuum, in
the shape Of a colored deposit, is at times
taken out, dried, aud smelted
The savings Of science, however, are
not all made in the dust heaps of London,
though in the brief outline we have given
Of the mode Of utilizing some Of the con-
stituents Of the waste Of the great city,
vast economy is indicated A singular
and recent French discovery is that sheep
draw considerable quantity of potash
from the land on which they Craze, much
Of which is ultimately excreted from the
skin with the sweat. 1t was pointed out
BY Chevreul that this peculiar compound
(siint) forms no less than one-third Of the
weight Of raw merino wool, while Of ordi-
nary woods t constitutes about Is per cent
Of the weight Of fresh fleece. As the suint
may be extracted BY mere immersion in
cold water, it is easy for the manufacturers
to produce more or less concentrated solu-
tons from which the potash may be recov-
cred by appropriate treatment. The de-
velopment of the new industry is principally
due to MN. Maumene and Rogelet, and
their process consists in evaporating the
solutions, which are sent to them, until
perfectly dry and somewhat charred resi-
due has been obtained. This is placed in
retorts and distilled very much in the same
manner as coal at gas works, and the result
is that, while much gas is evolved which
can be used for Illuminating the factory,
and much ammonia is expelled which can
be collected and utilized in many ways,
there remains residue which chiefly con-
sists Of carbonate, sulphate, and chloride
Of potassium. These three salts are sepa-
rated by the usual method, and then pass
into commerce. Curiously enough, they
are remarkably free from soda.
The wool manufacturers Of Rheims, FL
bout, and Fourmiss annually wash the
fleece of 6,750,000 sheep, and the amount
Of potash, reckoned as carbonate, which
the feeces would yield if all were subjected
~ wy NC" PloSesS, iePtese"'s q '@i"S VI
s4VV'oVo- Inc oy-products OF gas WORKS
are so valuable new that factories are &C
tually set up beside such establishments
for their utilization. The most important
is alum, which, like sal ammoniac, once
came, at a great cost, from Egypt, but is
now MAINLY procured from an luminous
snale' wnicn forms tne roofs OF c9ai mines,
ana winch mas 70 DC Drought % tne surface
before the coal can De gained. ms was
ior long Tune a perfectly reiuse ma'erial'
covering acres oil ground IKE the scorie
anu cinder heaPs pub chemistry mas iou1d
IL OUT ana now OBTAINS tne product oy
setting nre 70 tne snare, tne earoon ahe
sulphur wnicn IL contains oeing sumeient
ior 'ne purpose. Inc iriaoie porous resi-
qua are Afterwards hea.ea IN IRON pans
Win suipnuric aeiu' 10 "hieh Is auueu tne
ammonia rom tue gas lquof' anu Iiie three
pouies comoine win wafer 10 make COM
mon or ammoniacai aium,
Nearly every article OF the toliet oo1tie
or the saehes Is maae from waste, some
'imes rom iouiiy odoroos matters "A pc,
euiiar ietid on, Termed Iusei oil, = formed
IN making oranuy ana WHISKY ms iusei
on uis'iied WIN suipnufie aciu ana s ace
's,e Oh potash, gives .ne Oh o. pears nc
on q apPlss = made iioI .he same iuse,
On W ais'ii'acion win sr,Phu.'c aeia anu
p,oniohiae Vi Po.asn' Ane Vi, Vi PineaP-
Ples = oe'ainea if1m 'ie procec' Oh 'he