Amador ledger., 1908-01-10

human eye is normally at rest tor an
infinite distance, accommodation be-
ing accomplished by angular muscles
more convex. In apes and all mann
malta and birds, as we'll as in some
amphibia, the mechanism is the same.
Birds have an advantage, as their
striped muscular system enables them
to make rapid changes keeping fast
moving images in focus. Reptiles
and fishes give Quick adjustment by
drawing back the lens instead of de-
forming it. The bigger the animal
the poorer its accommodation. Among
very inferior invertebrates are found
very high eye mechanism, and some
mollusks have eye adjustment COM
parable to that of highly developed
birds. In some respects-vi vision,
sight. smell, ETC., man is surpassed
by other animals.
On recently fusing little tantalum
powder, Siemens and Halske placed
it in kind of Crookes' tube instead
of an electric furnace. On the anode
the metal powder received the bonn
bardment of PARTICLES from the
cathode, and was quickly fused. A
magnet DETECTED the tiny stream of
bundles, and made it act upon any
desired part first of the mass of metal
exposed at tho anode.
OF 235 bore holes IN the Witwaters-
rand area, 40 go below 1900 feet.
Most of these are in bedded strata,
with dip, and are not vertical. j.
kitchin, a London engineer, reports
that 20 bore holes have an average
inclination of 440 feet at depth of
200O feet, and an extreme OF 2370 feet
in bore-hcle 4200 feet deep.
For many experiments now 1t is
necessary to exclude all outside
sound. What is endorsed by Prof. S.
l. Franz, as the one absolutely noise
square and high on the top floor of
the physiological laboratory of the
University of Utrecht. Its walls are
about IL inches thick. From the in
side these are made up of successive
layers of horse-hair felt, porous
stone, dead air, wood partition,
ground cork composition, and a
piastered surface. The ceiling,
though somewhat simpler made, has
similar layers. The boards of the
floor were sawed and the joints filled
with lead to stop vibration, layer OF
lead was then covered over all to the
thickness of more than an inch, and
nearly half an inch in thickness, and
sometimes a second carpet. A small
window opens into little connected
room with a roof window, the two
windows supplying both sunlight and
ventilation. The door is double,
the outer part accurately fitted with
felt, and the inner part composed of
three layers with an air space. In
the noiseless room sensations vary,
sometimes including variety of body
sounds, sometimes feeling of pres
sure. The she'll held to the ear no
longer seems to give forth sound, the
tones for which the she'll is resonant
being absent.
The great abundance of life in the
ground is again shown by A. h. Hick-
mott, a gardener of Reading, Eng,
10 improve his garden he made 80
depressons in the ground, an inch or
two deep, pressing cabbage or
lettuce leaf into each, and covering
them with pieces OF board, moisten-
ing in dry weather. In one day he
caught 376 slugs, and from ,Jnly to
the middle of November total of
IA, 470. Hensen, German naturalist,
placed the earth worms of an acre at
50, 900, but if this garden has 81
square yards it must have supplied
slugs at the rate of l,l5O, 600 to the
acre.
The SUMS temperature has heen
lately estimated at 5373 deg, $500
deg. and 5400 deg. @. Millochau, a
French astronomer, has compared the
thermal and optical results with
those of an electric furnace of known
temperature.
The aerial graphoscope of Eric
Stuart Bruce, secretary of the Lon
don AeronauticaI Society, has the
curious feature of showing lanter pic
lures in bold relief without the aid
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