The daily Cairo bulletin. (Cairo, Ill.) 1878-1???, 1880-11-13
POPULAR SCIENCE.

The adulteration OF milk by starch
may be detected by this simple meth
cd Add few drops OF aceIic acid
to the suspected milk; boil the milk
and filter the whey. II the milk con-
tains the slightest trace Of starch q
single drop of the iodine solution
will give blue tint to the whey.
A new process for the manufacture
Of armor plates, recently invented in
England, introduces steel into their
construction, whereas formerly they
were made wholly Of iron. 1t IL
claimed that the steel greatly increases
the rrsistive power Of the plates The
war ships Of the present day are like
ly to be clad with this new kind Of
armor
Herr Lewisohn OF Stuttgart has IN
vented satisfactory method Of taking
photographs on leather A coating
of copal varnish is first applied TO the
leather and allowed TO dry well. A
second coating consisting Of albumen
and white lead is then addel, and
when this is dry, the faceof the lesth-
CT is given the desired sensitive sur
face by being introduced into the sill
yer bath.
A cheap artificial leather is pro-
duced by German inventor who uses
for the purpose stron: binding, wa
terproof, flexible glue, in volatile
solution, which he imprcgnates by
heavy pressure, with fock OF cotton,
oakunl, finely ripped rags, scraped
leather, etc. lie 50 spins and Weayes
the fibre thus formed, or presses II in
iron, that he can make from it water
proof cloth, straps, shoe soles and
heels, book coverings and like articles.
A simple and interesting expert
ment in magnetism has been intro
duced by Professor Thompson. A
thin plate Of hardened steel Is writes
upon with q msgnetized iron style,
and the path trayersed by the style is
thus lnagnetized. In order 10 read
what had been written, iron filings are
sprinkled on the plate, and the plate
is then placed in vertical position,
when, OF course, all the filings fail oil
except those which happen 20 fall on
the part of the plate nmgnesized by
,he style, leaving the writing in re-
lief.
A military small-arm manufacturer
at Wurzburg has invented simple
apparatus which will enable any Or
binary brecch- loading rife or gun
with central ignition To be used as o
saloon rifle, thus allowing men to be
exercised Ut target practice IN the drill
shed, or even IN thelr rooms. The i'll
| vent,on consists OF n tube OF cast steel
! of the same length as the barrel Of the
rifle with which il is 10 be used, but
of very small calibcr. This tube il
fitted with brass rings about M inch
wide, which enable it 10 be- pushed
into and pulled out Of the barrel of u
rifle without in any way injuring the
interior of tile piece. The cartridge
used is of steel and is SO designed that
none OF the gas generated by the ex-
plosion OF the small charge Of deton-
ating substance used to propel the bull
let can escape TO lnjure The bore OF the
riho.
Sponge underclotling is recent
novelty invented aud patented in Bcr-
| lin. Ii is claimed for il that it can be
clcansed more easily than WOODEN
goods, and being more flexible, docs
not chate the skin SO much. IL is q
bad conductor and tends 10 keep the
surface temperature uniform. One
who wears this undcrclothing is not
likely to lake cold, for it absorbs the
perspiration without checking it,
After the mineral ami vegetable i'm
puritics in the sponses have been suf-
ficienlly beaten by a heavy hammer
to admit of being readily washed out.
| the sponges are dried, and pared with
a sharp knife. These parings are then
ewed together. The fabric is pre-
Shared without any use Of poisonous
DIVES, which, as Incorporated in cloth
underclothing, sometimes proves very
| l.,o,ar;oua IN the system,