Democratic Northwest. [volume] (Napoleon, Ohio) 1869-1894, 1889-06-27
SCIENTIFIC AND INDUSTRIAL.

Eighty or more species of insects de-
pend either wholly or in part on our
grasses for food.
The effect of the, electric light on the
Eiffel tower is to illuminate all Paris in
manner unprecedented.
At the horticultural show at Troca-
dero, in Paris, during June there will be
5000 rose trees, of 5000 varieties, in
bloom.
A company has just been formed at
Rochester, N. Y, which saves thirty per
cent. of the fuel now used in smoke and
ashes. 1t is an excellent device for small
establishments, and is having quite
run.
A tannery in New Orleans, La, is in
correspondence with Georgia parties for
100000 tons of Mangrove bark. Pal
metto roots are said to be nearly as good
for tanning purposes, and easier to OBJ
tain.
A soldier belonging to detachment
of the Australian army in Transylvania
was recently killed by. bullet from a
Manlicher rifle discharged during target
practice at distance of more than two
and half miles.
Since the termination of the dynamite
patent in 1881, there has been immense
industry in the invention of high explo-
sives, and there are now more than three
hundred varieties. A dynamite cartridge
one foot in length takes only 1-2A 900 of
a second to explode.
A metallurgist gives as a reason why
steel will not weld as readily as wrought
iron that it is not partially composed of
cinder, as seems to be the case with
wrought iron, which assists in forming
fusible alloy with the scale of oxidation
formed on the surface of the iron in the
furnace.
According to the statistics of DR.. Fodd,
Of the Georgia State Medical Society, the
life expectancy of various countries is as
follows: United States, IS years; Eng
land So; Russia and Chill, 2S; Soudan,
23; France, 454; Europe, in medieval
times, 20; and Rome in the time o
Caesar, is.
Electricity is now used in France to
produce high temperature in which steel
will melt in moment. The arc in which
the metal to be smelted is placed has such
an enormous capacity that light equiva-
lent to 100, 900 candles is concentrated
on the narrow space of few square cen
timeters only.
Consul Griffin, at Sydney, Australia, in
a report to the Department of State says
that the disease known as anthrax or
splenetic apoplexy, which for so many
years has been devastating the herds OF
New South Wales, is in fair way OF
being very effectually checked by Pas
teurs system of inoculation.
That free swimming crustaceans are at
tracted to a stationary net by the electric
| light may now be considered established
! beyond doubt, and that the illuminated
tow net can be used in thirty fathoms Of
water to great advantage to the fishermen
mas lately been successfully proved by the
Liverpool Marine Biology Committee in ;
recent dredging cruise.
A very useful exhibition of appliance:
for preventing injury to horses by slip
ping in the streets has been opened at thu
| premises of the Animals Institute
Knightsbridge, London. The practica
value Of this exhibition is enhanced by {
series of lectures by specialists on horse
shoeing, street accidents by slipping anC
kindred subjects.
OF the metals discovered in the SUI
the most important are sodium, magne
SUM, barium, acalsium, zinc, copper
aluminium, nickel, chromium and iron
Many of the rarer and less known metal
would also appear to be there in SOM
abundance, judging by the facility will
which their presence may be detected
Although heavier metals, such as plati
mum and gold, have not been seen, it b.
no means follows that they are absent
Their weight would prevent them bein!
easily found by the spectroscope.
DR.. Won Duhring reports to the Britis
.!aedicdl Journal a case of tuberculosi
which was contracted by wearing pal
Of earrings. The patient, girl of four
teen years, removed the earrings from tn
ears of young girl who died of con
sumption, and wore them in her owl
ears. Soon after, an ulcer formed in tn
left ear, the discharge from which, whel
examined, was found to contain tubercl
bacilli, and gland in the neck also en-
larged and liberated. The patient de
veloped pulmonary consumption, and a
the date of the report was sinking re-
| idly.