The Cheyenne daily leader. [volume] (Cheyenne, Wyo.) 1870-1884, 1881-03-18
SCIENTIFIC.

Alum and plaster of Paris, well mixed
in water and used as q thick cream,
form a hard composition and also q use
full cement.
DR.. Emmerick, a German physicist.
declares that polluted water does not
inlure the health. He 'purposely drank
a quantity of it himself, and the only
result was that it cured him of a gastric
catarrh.
A recent course of experiments made
to determine the heating power of gas
shows that one cubic foot of ordinary
sixteeh-candle coal gas will develop Sl8
heat units. while water gas will give
only about 1877 heat units per cubic foot
The habit of fish II return to the same
place in a river to swarm is well known.
1t Is 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 .sset."
This is why new ground for oysters
needs to be covered with clean shells o.
stones. Oyster-spawn will not ''set''
on mud or muddy, dirty. or greasy mat
ter, ever il on shells. Hence shells are
much in demand for preparing new
ground.
A very successful experiment with a
compressed air locomotive was lately
made in Woolwich. England. The en-
CINE was provided with a reservoir of
one hundred cubic feet capacity. With
air filling this chamber at one thousand
pounds pressure on starting, a run Of
sixteen miles vas made ut q fair rate of
speed. So great r 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 a report by Professors
Barff and Mills OF the Glasgow Univer-
sity, and DR.. Stevenson of Guys Hospi-
tai, meat six months old was found 20
be perfectly sound and good, the mus
cular fibre unchanged, and the nutritive
properties unimpaired. The material
employed is said to be less expensive
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 'The Engineer: For
white and for all pale and delicate
shades take t~wenty-four parts by weight
OF parrafine and add thereto one hum
bred parts of pure kaolin (China clay).
very dry, and reduced to q fine powder.
Before mixing with the kaolin the par
afiine must be heated to a fusing point
+ Let the mixture cool, and it will form o
homogeneous mass, which is to be re-
duced to powder and worked into q
paste in a paint-mill with warm water.
This is the enamel ready for applics
ton. 1t can be tinted according 70
fancy.
A very slight declevity suHicss TO gre
the running motion to water. Tnrss
inches per mile in a smooth. straight
channel gives a velocity of about three
miles an hour. The Gauges, which
gathers the waters of the Himalsys
mountains, the loftiest in tho world, h
100 miles from its mouth, only 900 fcSa
above the level of the sea-, and to fan
800 feet in its long course the water re-
1uires more than a month. The grcss
river Magdalena, in South America,
running for 1000 miles between two
ridges of the Andes, falls only 500 fees
in all that distance; above the distance
of 1000 miles it is seen descending in
rapids and cataracts from the oun
tains. The gigantic Rio de la Plata has
SO gentle a descent to the ocean that in
Paraguay. 1900 miles from its mouth.
largo ships are seen which have sailed
against the current all the way by tho
force of the wind alone-that is TO say.
which, on the beautiful inclined plane
of the stream. have been gradually lift
cd by the soft wind. and ever against
the current, to an elevation greater than
our loftiest pines.