Greene County herald. (Leakesville, Miss.) 1898-current, 1901-03-22
SCIENCE AND INDUSTRY.

SCIENCE AND INDUSTRY.
Deaths from consumption in Phil
adelphia are estimated to be one-third
less than they were Is years ago.
The health authorities say the i'm
provemspt is due to their continuous
battle against the disease.
Kochs theory that mosquitoes
should be let alone, but that people
should be cinchonized, Major Ross
considers as impossible to put into
execution In British colony, such as,
for instance, Sierra Leone. The best
method, in his opinion, is destruction
or removal Of the mosquito by means
of surface drainage, cutting down I'M
dergrowth and the use of various
culicides.
The big German factories which pro-
duce synthetic or artificial indigo are
making tremendous efforts to get their
product on the market and drive the
vegetable indigo out of use. 1t is
questionable, however, whether the
artificial indigo will ever serve all the
purposes Of the natural An article
in the st. James Gazette says that
British manufactures are none of them
using the synthetic indigo for wool
and that even for cotton goods its legit-
innate usefulness is limited.
The newly invented process OF
bleaching baled yarns Is carried out as
follows: The yarns are packed either
in single pounds or in packets of sew
eral pounds, in receptacle before
they are treated with the bleaching
fluid, care being taken that the pack
ing Is so done that the said fluid acts
on tho threads lengthwise or in the
direction of the f1bres. This is effected
by placing the bundles Of yarn in the
receptacle which is open at the top,
in q perpendicular instead of a hori-
zontal position, as has previously been
the practice. By this method it Is
claimed that great quantities of baled
yarn can be bleached perfectly white
without the trouble of unpacking.
which, Of course, saves time, and
therefore money.
In an experiment made before a
meeting of one of the sections of the
New York Academy of Sciences, Pro-
lessor E. R. Won Nordhoff produced
by means of q miniature steam
whistle. operated with compressed air,
sound which was inaudible because of
Its high pitch, though the sound
waves produced were detectible by
means OF sensitive fame. The object
Of the experiment was to illustrate
method Of measuring the length Of
short sound waves by means of
dihraction grating, as light waves are
measured. The waves in this instance
were shown to have length Of about
three-e ighths Of an inch Audible
sound waves are said to range in
length between 70 feet and three or
four-tenths Of an inch. These num-
bers vary considerably, however, with
the person.
A recent European invention is
process for making artificial sponges.
The method is based on the action OF
zinc chloride on cellulose, by which
spongy compounds similar to starch
are produced. These products when
placed in the water swell, and, and In
an atmosphere sufficiently dry, soon
become hard again. The formula for
making the sponges is given as fol-
lows: One hundred grams of cellulose
are treated with four Kilograms of a
concentrated solution of zinc and So
dunn chloride. This results in a plas-
tic mass, slightly viscous, to which is
added kilogram Of coarse bay salt
The substance is then placed in a
specially constructed mill and pierced
with two or three hundred holes, to
form canals, and is then placed in 4
bath of alcohol and water for "a hours.
These sponges can be produced quite
cheaply, and possess great durability,
though they are said to be harder than
a q n,,t1