The Sentinel. [volume] (Trenton, N.J.) 1880-1882, 1882-11-04
Scientific.

nearly 2,7C0,CO0 tons of puddled iron,
and imported 80, goo tons besides.
Grapes exposed to sunlight contain
81 per cent. less acid than those which
have remained in darkness.
The Engineering Nea0s says there
are over l400 bridges in the Illinois
Division of the Wabash Railroad.
To remove ink from photographs,
| moisten the pad with water acidula-
ted with muriatic acid 40 per cent?,
and rinse well.
Chemically regarded, mica is made
of silica, alumina and potash. Silica
is one of the hardest substances in ma.
lure, known in its purest and most
beautiful form as rock crystal.
The Washington Monument now
exceeds 300 feet in height, and is rising
at the rate of about foot a day. The
workmen are protected by a strong
netting which surrounds the top of
the monument.
DR.. Andres and M Faye both agree
that cyclones, ornadoes and trombes
are one and the same mechanical
phenomenon, and that their powerful
action is due to the force in upper cur
rents.
Of all the men-of- war In Europe,
Italy has the most heavily iron-plated
and possessed with the most formida-
BILE guns. The Duilio and the Dandolo
have armor twenty-five inches thick,
and they each carry 100-ton guns.
A tree called the travellers tree of
Madagascar yielIs q copious supply of
fresh water from its leaves, very
grateful to the traveller. 1t grows in
the most arid countries, and is a good
proof of the wonderful provision of ma
ture.
TeacE ers in the public schools of
France are very seldom paid more
than 50 q week, and as the expense for
salaries is now little over SIS, 0O0,0 600
the Minister of Public Instruction re-
fuses to add to this amount and so
increase taxation.
1t has been noticed that copper
when melted with salt and subse-
quently cooled is much tougher than
ordinary copper, this being due, in ali
probability, to the removal of the
cuprous oxide, which is generally pres
ent in greater or less quantities.
The persistence of the magnetic
property observed in certain trees is
attributed by M. Larroque to the
transportation by lightning of small
particles Ct iron hell in suspension
with other matter, which makes up
what is known as the d ust of the air.
When 1t is necessary to bring up a
child OF cows or nurses milk it has
been proved preferable to use the milk
OF COW, unless the nurse is we'll fed
aAd Kept from doing hard WORK. Hu.
man milk is quickly impoverished by
severe mental Or physical labor.
There is eminent medical authority,
says the Baston Journal of Chemistry,
| tor the statement that unrIpe or very
ola potatoes contain q certain quantity
of solanine. This may produce serious
results if the potatoes are boiled with
their skins on, and ii they are eaten
in large quantities.
The following is a celebrated Lon
don anti-asthmatic powder :" Potas.
( sii nit1atis and pulv. anisi, each one
half ounce; puiv. stramon. fol-, che
ounce. A thimbleful of the powder,
placed on a plate, is pinched nto q
conical shape and lightt d at the top.
II is then placed near the patient, who
inhales the fumes.
A new building material has been
discovered at Sewa, one of the Celebes
islands. 1t is known as fossil coral,
and when cut from mass is soft, but
on exposure to the air becomes hard
like brick. Tt is thus far satisfactorily
stood the tests that have been applied
to it, and large quantities have been
ordered for building purposes.
One by one the more precious metals
are found deposited in thiS country,
and in some cases, as in nickel, the
unsupported supplies prove greater in
volume than the previous yield of all
other countries combined. The latest
of these discoveries is that of vana-
dunn, which has been taken from an
Arizona mine in larger paying guam
titles than ever before known.
F. ]. Faraday is inclined to the be-
lief that the breathing of air devoid of
the usual quantity of oxygen is apt to
develop germs otherwise harmless into
those which produce consumption.
AS giving support to his hypothesis,
he cites the decrease of consul N ptiOn
-, xuoII ventilated torraal~s ord tha