Brenham weekly banner. [volume] (Brenham, Tex.) 1877-1907, 1891-10-08
SCIENTIFIC MISCELLANY.
AN ELECTRICALLY OPERATED MICROSCOPE.

AN ELECTRICALLY OPERATED MICROSCOPE
A Munich institution has made s
magnificent microscope for the
Worlds Fair, at a cost of $3.50
An electric current supplies the
light, which, placed at the focus of 6
parabolic aluminium reflector, reach
es an intensity of 1000 candle
power. Electricity also centres the
quadruple condenses by an auto.
matte mechanism. The heat gener-
ated by the intense light makes nee
essary a cooling apparatus, which is
an electrically regulated machine
iberating a fine spray OF fluid car,
bonic acid from copper reservoirs in
which this substance is stored under
pressure of % atmospheres. So
great is the cold produced by its
vaporization that the carbonic acid
used need not exceed in quantity
four or five grains per hour. With
ordinary detectives, the highest mag
nifying power of the instrument is
about 1000 diameters, but with
the oil immersion this may be in
creased to 10000.
A NEW TREE KANGAROO.
A new tree-climbing kangaroo has
been discovered in northern Queens
land, the specimen exhibited having
been taken from height of 80 feet
in straight tree. This remarka-
bic marsupial has received the spe-
cies name of Denrolagus muelleri,
and has a body about two feet in
length, with a tail somewhat longer.
The disproportion between the fore
legs and the hind-legs is much less
than in the ordinary kangaroo and
its toes are strong and curved to en-
able 1t to climb tall and straight
trees, on the leaves of which it ex-
lists. This is not the only tree kan
CARGO, similar species having been
found in Queensland several years
ago, and two species being known in
New Guinea.
In long observation among his
countrymen, a German doctor has
found that only 1 person in Is has
both eyes in good condition, that 7
out of 10 have one eye stronger
than the other, that 2 out of 5 are
affected with astigmatism, and that
nearly so per cent have only an i'm
perfect appreciation of colors.
Iron paper shown at the great ex-
hibition of 1851 led to the produc-
Il rolled iron sheets of which
% uld be required to make the
an -i1lahaeNf the thin
IN . BFitis ssociation paper,
DR.. W. B. Hambieton regarded con-
sumption asa disease of civilization
due to causes reducing the breath
ing capacity. Its prevention should
be sought by arranging work, habits
and Surroundings so that their
general tendency should be to ex-
pand the lungs. Close and badly |
heated rooms should be avoided, as |
well as habitually working in cramp-
ed or STOPPING positions, and the
wearing of corsets and tightftting
clothes. Active exercise in the open |
air should be taken, bedrooms
should be well ventilated, wool
should be worn next to the skin, the
body should be held erect, and deep
breathing through the nose should
be praeticed. When the disease
las been contracted. prompt treat
nent is of the greatest Importance.
SEASIDE SCIENTIFIC STATIONS.
The following list represents the
number of laboratories of marine
biology which have been established
n the different foreign countries:
tally, L; Austria, 2; France, s; Hol-
and, 5; Belgium, 1; Germany, 1;
sweden, 2; Great Britain. 5; Russia,
); Japan, 1; New South Wales, 1.
The most important of these stations
hat of Naples, cost 100000, and
S maintained at an annual expense
f over $4,000. In the United
states there are two laboratories
ne under charge of the o. S. Fish
Commissioned Woods Hall, Mass, I
nd new one has just been estab-
shed at Sea Isle City, N. j.
ELECTROMAGNETIC DISCOVERIES. {
In the progress of electro mag
etc science, according to Prof. A.
Knnoll-- ILL., e. | 1