The Democratic press. [volume] (Ravenna, O. [Ohio]) 1868-1901, 1881-06-30
SCIENTIFIC AND USEFUL :
Iron vessels Of large tonnaes arc dis
placing small wooden crafts on our
great inland fresh waters as we'll a6,,on

Iron vessels Of large tonna9a are dis
placing small wooden crafts on our
great inland fresh waters as well Son
the ocean.
A phonograph of an improved con-
structiOn is to be tried at Paris for
teaching pupils the pronunciation of dif-
fcult words in foreign languages.
Physicians in the mining regions say
the presence of diphtheria is directly
traceable to oleomargarine, adulterated
molasses, sugar, ETC., which are largely
used in that section. :,
| All ordinary fruit acids are said to
act upon tin. and one case is reported
| in which persons were made violently
sick from eating fruit preserved in tin
cans, no foreign substance except tin
being found in the fruit.
The object-glass for the Lick Obser-
vatory telescope in California is to be
three feet in diameter, and if success.
full, will be the most powerful instru-
ment of the kind ever made. About
three years will be required to finish
the telescope. g aftg& .e5fesas,,.t.
Sir Wyvile Thompson has estimated
that the pressure upon q mans body at
depth of l., 600 feet beneath the sOr-
face of the sea would be equal to q
weight of twenty locomotives. each with
good train loaded with pig iron. .s..s
1t is said that during hailstorm in
Geneva on January 19, Prof Colladon.
observed that the hailstones repelled
each other as they fell. and that after
lying quiet for a moment or two on the
ground, bounded about like the electric
hail experiment of Newton with pith-
balls. --'.'
. -s4F p
Excavations commenced a short dis
tance from the walls of Pompeii, with
view of ascertaining the nature of
the surroundings of the city have led
to the discovery. within an area of q
few square yards. of thirty skeletons.
ten of which were huddled together in
one room of a small suburban villa.
Bracelets, necklaces, earrings and other
objects were found upon the bones.
According to the stories of M. He
bert, the storms which reach the Euro
pean coast from America originate for
the most part in Mexico, Central Amer
lea and the northern parts of South
America; but they do not generally
strike the Atlantic until after they have
traversed a more or less extended part
OF the North American Continent. The
storms which originate in the United
States reach Greenland, or pass the
neighborhood of Iceland or the Farce
Islands. too far away to affect Europe. .
About the beginning of August the
seventh biennial Intern ationA Medical
Congress win be held in London The
last meeting took place in Amsterdam
in 1879. OF the 4, 1000 invitations lately
issued, it is expected that at least 1000
will be accepted, and the papers to be
read are likely to exercise very con-
siderable influence on the various
branches of medical science and prac-
tice. An exhibition of the Park Museum
of Hygiene, comprising everything of
service for the prevention, detection.
cure and alleviation of diseases, will be
open at South Kensington from July 16
to August 13. -
A curious experiment in heat is per- Z
formed with an apparatus devised by
Dr.. Grassi. The apparatus consists Of
three concentric vessels separated by
annular spaces of about three-fourths
of an inch. The outer space is filled u
with oil, and the inner with water The
oil is heated to q point about PIP de-
grees Fahrenheit, when the water be-
gins to boil. Oil heated to 800 degrees
IS then introduced into the central YES ,,.
sci, and falls rapidly to temperature
about that of the boiling water. DIR.
Grassi finds that this central oil cools
the more quickly the greater the heat
of the outer ring of ola result seem-
ingly very paradoxical. .,,s- ~. cil.-.- I'd