Iowa County democrat. [volume] (Mineral Point, Wis.) 1877-1938, 1879-12-26
Popular Science.

utactory.
X appears from recent analytical re-
searches that French zinc is the most
arseuical OF all zines at present found
II commerce.
Rhine defines ultramarine rs So
dunn aluminium silicste, having in SO
luton Il variable mixture OF sodium
sulphide and oxySaltS Of sulphur.
The quantity OF coal raised in Ger.
many in 1876 was SO, l26,SQS tons, an5
in 1873 il was 81, 426,774 tons. In 1878
the quantity Of lignites raised was To-
91l ll1tonS rs compared with l0,664, 49,
tons in 1878,
With regard to the degree of tenn
perature At which men can work in
tunneling high mountains, Professor
Dubois Raymond says it Is possible that
work can I've carried ON for short time
at 90 degrees contigrade if the atmos-
phere is dry, but not beyond 40 degrees
when the air is saturated with moist
ure.
Mr.. 4. w. Blyth, who read 4 paper
ON cows milk nj n recent meeting OF
the London chemical society, found
that cows suffering from very acute dis
ease may give milk differing in no es-
sential feature from normal milk ms
revealed by analysis, while local atiec-
tons Of the udder are easily recognized.
The statement that the juices Of red
flowers are acid, aud those Of blue ones
alkaline, is incorrect According e the
Transactions of the Munich Academy
OF Sciences" Nogel has proved that an
extensive series of blue flowers have an
acid reaction, and the red wings OF the
flowers pisum savitum are neutral.
The presence Of trichina in pork can
be readily detected with u microscope,
and people who like that article of diet
would do well TO insist ON II careful in
spection Of it before allowing it to APP
pear on the table. In Berlin every pig
killed must be examined with the ml-
croscope before it Is sold, or penalty
will be inflicted.
1t has been calculated that ii a single
grain of wheat produces fifty grains in
one years growth, and these and sue
ceeding crops be planted and yield pro-
portionately, the produce of the twelfth
year would suffice to supply all the in
habitants of the earth for lifetime: IN
twelve years the single grain will have
multiplied itself PA lao, CPS, 100000
times.
Among $3.50 colored children in the
schools in the District OF Columbia, OF
hom $50 were males and ,G9l te-
males, DR.. Swan NJ. Burnett found
twenty-four individuals affected with
color blindness, VIZ, twenty-five boys
(1.6 per cent and two girls (Oll per
cent. This proportion Of color-blind-
ness is very low, among whites it is 3
per cent. for males and D. 26 for females.
To make beautiful black color for
bronze II concentrated thin solution of
nitrate of silver is required. 1t should
be mixed with an equal solution of
nitrate of copper. and well shaken to-
gether The pieces which require col
oring are dipped into this solution and
left for q short time. When taken out
they should be equally heated till the
required black cover makes its appear.
ance.
The Nature reports the discovery, by
laborers, of an ancient burial-pace,
while they were making road near
Colbor, in Pomerania. Twenty urns
were found. Most of them had been
shattered by the penetration of roots OF
trees and by other causes. Three large
and two smaller urns were found to he
intact. Among the contents Of the
urns we're one iron needle and two iron
rings, besides quantity of glass beads
and rings and needles of bronze.
The German government has taken
steps to prohibit nil lads under l6 years
of age from smoking i'll the streets, and
the police III certain towns have had or
ders to enforce the rule and punish all
offenders by fine and imprisonment. A
Belgian physician has found that the
too general and excessive use Of tobacco
is the main cause Of color blindness, an
affection which is occasioning anxiety
both in Belgium and Germany, from its
influence upon railway and other acct.
dents, and also upon military ineilici-
ency.
The London Chemical Ne,os gives the
following testimony in proof that cop
per salts are not poisonous: "Mr. G1l.
ippe, in a paper read before the biologi-
cal society Of Paris, described the fol-
lowing experiment: A rabbit received
daily for six months two grams(9 cop
per acetate. AT the end of this time it
was served up at the table of the learned
chemist. The liver weighed seventy
grams, and contained thirteen cent?
grams of copper. NJ. Galippe partook
OF il, and has suffered 30 inconven-
ience."
Most people will remember the furore
caused by the so.called tempered glass
invented by M. De La Bastie, and the
multiplicity Of purposes for which il ID
said to be adapted. Butthe lamp-chim.
neys, breakers, etc, made Of that ma
terial had a fatal facility Of suddenly
exploding into thousand fragments,
sometimes spontaneously. 1t is now
announced that De La Bastie has made
such improvements III his glass temper.
ing process that the quality Of the prod.
uct il immensely more durable.
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