Amador ledger. (Jackson, Amador County, Calif.) 1875-19??, 1908-07-24


s. A. Forbes, this icing an average of
645 birds to the square mile, while
the average for the entire year
appears to be 722 to the square mile.
The summer estimate is based on
count over a strip of IL square miles,
showing TAO birds belonging to 50
species The principal species, in the
order of abundance, we're the English
sparrow, meadow lark, bronzed
grackle, mourning dove, dickcissel,
redwinged blackbird, prairie horned
lark, flicker, robin and field SPAR ow,
and these ten species included more
than 70 per cent of the birds seen, the
English sparrow alone representing Is
per cent. The persistence of the birds
in the face of extraordinary changes
in environment is one of the striking
impressions of this study Aside
from the results of the introduction
of the English sparrow, and the
direct destruction of game birds and
birds of prey, the main effect of
human occupation seems to have been
the withdrawal of the prairie birds
from the Indian curn area to the
pastures, meadows and fields of small
grain.
fabric called "solaro'' has been
produced by English manufactures IN
response to the call for something
mole scientific than all-white cloth
Ing for tropical sunshine. 1t has a
red backing interviewer with the out
side cloth without showing through,
and the face may be white, gray, or
any desired color. The red inside
arrests the actinio rays, preventing
sunstroke, stomach disorders and
other effects of intense summer heat.
The material is of fine wool, shower
proof as we'll as sun-proof, is suitable
for both sexes, and has been adopted
for British officers appointed to
tropical service.
Magnalium, the new alloy of Ber-
lin syndicate, claims advantages that
make it most important and inter
eating material. 1t contains from 40
to SO per cent of aluminium, the re-
naming percentage being chiefly
magnesium, and it retains the good
qualities of aluminium, while having
the much desired greater hardness
and greater tensile strength, with
greater resistance to oxidation than
any other light metal or alloy. 1t is
almost unaffected by damp air, water,
gaseous ammonia, carbonic acid and
most organic acids. 1t can be cast in
the liquid condition, like pure
aluminium, and the castings can be
macbined, acquiring a smooth,
mirror-like surface. Unlike pure
aluminium, it may be cut to perfect
rew-threads and filed without elogg-
ing the file or tearing the material.
The uses found are already quite
numerous, and include kitchen uten-
sils, parts Of spinning and milling
machinery, saddle skeletons, surgical
appliances, and chemical apparatus.
instantaneous photographs with X
rays have been known for several
years, but it is only recently that Dr..
Graedel, of Mannheim, has made them
practicable as part Of the physician s
every day work. In a late London
demonstration, satisfactory pictures
were taken in one-hfth to one-half of
second. with slight modification of
the ordinary apparatus. The CON
tinuous current of 200 to $50 volts
from the usual electric supply main
gives the best results, and a large
primary current up to 80 amperes-
is used through special trIple-anode
electrolytic interrupter. At 80
inches the parts are shown in almost
exactly natural size, with practically
no distortion, the pictures being
good.
The diamond was first burned by
Davy and Faraday in 1919. 1t was
held on platinum rod in glass
globe of % cubic inches of pure
hydrogen, and the Duke of Tuscany IS
burning glass-a lens of IA inches and
one of ) inches separated 80 feet
concentrated the suns heat. In q of
an hour the stone burst into a scarlet
flame. Out of focus it blazed
minutes, and was consumed in two
more trials.
Mosquitoes being one OF the pests
OF tropical countries, Maxwell Letroy,
of the Indian EntomoInOipnI nanArt-