The Ohio Democrat. (Logan, O. [Ohio]) 1886-1906, 1889-03-02
SCIENCE AND INDUSTRY.

Ore stamping by electricity is con.
sidered the only sufficient economical
system TO permit OF low-class ores be.
ing treated Mt a profit.
In Greece, an industrial school for
girls has been opened at Athens. -Four
hundred girls are employed there, with
the happiest results.
Since the telephone was established
in Switzerland, in 1860, siAty-one towns
have been provided with it, and there
are now 6,9li telephone stations, LOCO
of which are in Geneva.
In the new process OF mctal-plating
the inventor does away with batteries
and dynamos and depends upon q
double electrical composition. In cop
per-plating cast-iron an alkaline bath
is used in place of an acidulated one.
The uses of the cotton plant are
developing rapidly. Formerly the fiber
of tho blossom was only part utilized.
Then the seed began to supply large
proportion of the "olive oil' and
"lard" in the country, and now the
hulls are found to be cheaper and bet
ter than the wood for paper pulp.
--Sunhower seed is coming to the
front as an article otcommercial value.
AS an admiXture to chicken food its
merits are indisputable. Veterinarians
use it in medicinal way in the treat
ment of horses. It's growth is con-
sidered of use in the prevention of ma
laria, and the extraction of u valuable
oil from it is u lookcd-for result
Many entomologlsts are of the
opinion that the antennn of insects are
organs of hearing, though it is proba-
BILE that the auditory apparatus in
many insects is not confined to the an
tennI. Thus grasshoppers and crick
cts appear to have ears in their legs,
and the crustacean genus Mysis is pro-
vided with auditory organs i'll its tail.
Equally curious arrangements have
been observed in other insects.
If anything is needed to convince
men that gas is the fuel of the future il
is found in the recent scientific expert
1ltUIS WI SuON biltiU NY tllC NCi y
best method known of burning coal moi
more than 8 to 10 per cent. of the heat
is used, the remainder being wasted
by imperfect combustion, or carried
off through the chimney. When the
coal is turned into gas and the gas
| burned, nearly 80 per cent. of the heat
can be utilized.
The fact that the elementary sub
stances now number, according tc
chemists, full seventy, shows an in
crease, with the last fifty years, o
nearly one-fourth in the number known
The size of an atom of oxygen or nitro
gen is said to have II diameter of one
ten-millionth part of Il centimeter; they
are supposed to be in u state of con
stant motion, at the rate of seventy
miles per minute, and, to make then
visible, the present highest known
magnifying power Of the microscope
would have to be increased nearly ;
thousand fold
1t is only about once in tifteel
years that Mars comes as near as Sc,
OOO, 900 miles. It's orbit is so eccentric
that the interval between it and tn,
orbit of the earth varies all the way
from 36,000,000 miles to $1,000, 900
and it is only now and then that, "a
the two planets circle round in their re
spective tracks, the passing point il
where the tracks come nearest. The
last instance of very close approach
was in 1877; the next will be in 1892
Mars is much smaller than the earth
its diameter being only about A,2O(
miles. It's bulk, therefore, is only
about one-seventh, and its surface
about three-tenths of the earth's.