Daily globe., 1882-08-13
SCIENTIFIC.

Alum and plaster of Paris, well mixed
in water and used as a thick cream,
form hard composition and also use
full cement
DR.. Emmerick, German physicist,
declares that polluted water does not
injure the health. He purposely drank
quantity of it himself. and the only
result was that it cured him of gastric
catarrh
A recent course of experiments made
to determine the heating power of gas
shows that one cubic foot of ordinary
sixteen-candle coal gas will develop 318
heat units, while water gas will give
only about 1877 heat units per cubic foot
The habit of fish to return to the same
place in river 10 swarm is we'll known.
1t rs asserted that on going up they keep
the left hand of the bank, and that on
their return they take the opposite side.
Fishermen, take advantage of this fact.
Oyster-spawn when thrown off by the
mother soon seeks some clean shell or
gravel on which to fasten or ''set"
This is why new ground for oysters
needs to be covered with clean shells or
stones. Oyster-spawn will not ''set"
on mud or muddy, dirty. or greasy mat
ter, even if on shells. Hence shells are
much in demand for preparing new
ground.
A very successful experiment with q
compressed air locomotive was lately
made in Woolwich. England. The en-
gine was provided with reservoir of
one hundred cubic feet capacity. With
air filling this chamber at one thousand
pounds pressure on starting. a run of
sixteen miles was made at fair rate of
speed. So great are the advantages of
the bottled air. for street railways,
tunnels, etc, that an early adoption of
this class of motors in many localities
is sanguinely expected.
A new and apparently most valuable
method OF preserving raw meat. discov-
cred by Professor Artimini of Florence,
and patented in this country, promises
TO have a great effect on our markets,
According to report by Professors
Barf and Mills of the Glasgow Univer-
sity, and Dir. Stevenson of Guys Hospi-
tai, meat six months old was found TO
be perfectly sound and good, the mus
cular fibre unchanged, and the nutritiye
properties unimpaired. The material
employed is said to be iessexpensive
than salt, and not only wholesome but
pleasant to the taste.
For the brilliant white enamel often
applied TO cards, etc, the following for
mula is given in 1.-The Engineer: For
white and for all pale and delicate
shades take twenty-four parts byweight
of parrafine and add thereto one hun
dred parts of pure kaolin China clay),
very dry, and reduced to fine powder.
Before mixing with the kaolin the par
affine must be heated to fusing point.
Let the mixture cool, and Il will form a
homogeneous mass, which is to be re-
duced TO powder and worked into a
paste in paint-mill with warm water.
This is the enamel ready for applica-
ton. II can be tinted according to
fancy.
A very slight declevity suffices to give
the running motion to water. Three
inches per mile in q smooth. straight
channel gives velocity of about three
miles an hour. The Ganges, which
gathers the waters of the Himalaya
mountains, the loftiest in the world, is,
100 miles from its mouth, only 300 feet
above the level of the sea, and to fall
800 feet in its long course the water re-
quires more than month. The great
river Magdalena, in South America,
running for 1000 niles between two
ridges Of the Andes, falls only 500 feet
in all that distance; above the distance
of / 600 miles it is seen descending in
rapids and cataracts from the noun
tains The gigantic Rio de la Plata has
SO gentle descent to the ocean that in
Paraguay, 1,500 miles from its mouth,
large ships are seen which have sailed
against the current all the way by the
force of the wind alone-that is to say,
which, on the beautiful inclined plane
of the stream, have been gradually lift
ed by the soft wind, and even against
the current, to an elevation greater than
our loftiest pines.