The Londonderry sifter. (South Londonderry, Vt.) 1883-19??, 1889-12-26
SCIENTIFIC AND INDUSTRIAL.

Several calculating machines received
the gold medal at the Paris Exposition.
It is proposed to light up horses heads
with electric light during fogs in Lon
don.
The discovery on Fiji plantation Of
an antidotc to the banana disease, will, 1t
is expected, prove most valuable in all
tropical countries.
The result of the examination OF 5000
school children in various cities of Amen
lea and Europe is that the average OF
pupils who have defective hearing is
twcnty-six per cent.
In little town of Schleswig- Holstein
there is tax exemption for dogs "that
sleep with their masters and mistresscs
and so preserve them from govt, rheuma'
tism and like pains"
1t is proposed determining air tempera'
lures at great heights by using thermome-
tiers which, by closure of an electric cur
rent when certain temperatures are
reached, give light signal. Small bal
looms containing these thermometers are
to be sent up at night.
A mortar which, it is claimed, will
stand in all sorts of weather, is made OF
one bushel of unslacked lime and three
bushels of sharp sand, to which is added
one pound of alum mixed with one pint
of linseed oil. The alum will counteract
the action of frost on the mortar.
A remarkable chemical test for Asiatic
cholera has been suggested to an Italian
a.U FHFs vs. ". Bujwil Hydro
...--.. .r to culture broth
..uH,3-, le lera microbes is as.
...-a. l.rr. ct color, which does
r#... .-. lese particular germs
The Swedish Count, NJ. Bjornstjerna,
suggested more than forty years ago, in a
book on HThe Theogony of the Hindoos, "
that, as both poles must have been cooled
to a suitable temperature at the same
time, the earth might have been peopled
from the north pole with its white races,
and from the south pole with its colored
races.
The ancient copper mines on Lake SUI
perior are stated by Professor Newberry
to have been abandoned not less than
four hundred years ago, as is proven by
the growth of forest trees over the rub
bish heaps; and the old mica mines
of North Carolina and the serpentine
quarrles of the Alleghanies show like
evidences of antiquity.
During the past year no ashes have
been thrown up by Vesuvius, and conse-
quently the surrounding crops were moi
destroyed The sublimations of the
smoke issues were relatively scarce. On
various occasions the detonations and the
red-hot proiectiles thrown up with the
large quantities of smoke indicated
greater cruptive power.
After three years of the incandescent
light in the house of gentleman in Eng
land, in which was collection of finc
water colors, he finds that some of the
more delicate pigments have begun to
fade. The arc light has been found fal
richer in artinic rays than the incandes
cent. Magnesium ghtapproaches near
est to that of the sun in the proportion
of colored rays.
The use of luminous paint is rapidly
growing in this country. England has
heretofore had the monopoly of lumin'
Gus paint which, it has sold at So pei
pound. Other countries, however, have
entered into the competition, and Austri;
is now producing paint which is PLACED
on the market at fifty cents per pound
II &c cold +" hn made from roasted oyster
.r +.
Hra.. . h has been brought out