Nashville union and American. [volume] (Nashville, Tenn.) 1868-1875, 1875-08-22
GOLD. roc. HIST ANn Az.

animal heat. Fogs naturally become
impregnatcd with all deleterious ex-
halations from impure surfaces,
whether swamps, lakes, rivers or cities;
and it is well to kindle fires
in living or sleeping rooms to
expel that humidity which is SO ready
to catch and hold all organic poisons
that may float IN the atmosphere.
Keepout of the fog as much as possible.
After the sun has dispelled it, you may
walk, ride or drive in a different
climate, for solar heat removes not
only impure yessicles from the air, but
microscopic organisms which are the
germs of all malaria. Flammarion
found these in his aeronautical excur-
sions over nine thousand feet above
the surface of the earth. Currents Of
wind and air carry fine dust to an
equal height; and all know that the
suns heat moves the atmosphere.
Kaemtz has taken a great number of
measurements of the diameter of the
vessicles of mist in Central Germany
and Switzerland. They are smallest
in July and August. The least were
$780, 900 of an inch in diameter.
How a cloud or visible vapor IS
formed in the atmosphere where one
did not exist a few months before may
be worth a plain statement Let us
suppose a certain quantity of air at Sc
degrees contains 478 grains Of invisible
water, the air being quite transparent.
IF from the descent of colder air the
temperature falls from Sc to u de-
grees, or it receives an accession of
moisture it viii become Opaque. a
cloud is formed. A diminution of nine
degrees of heat viii cause l0S grains
Of vlpor Of water to be condensed and
become visibleasa mist or cloud. Con-
dense these clouds still farther and rain
is produced. Dew is atmospheric mois-
ture precipitated on grass, forest
leaves and other surfaces which absorb
atmospheric heat as the surface OF
pitcher Of ice-water. 1t Is not alone
the wet feet and garments that make
walking in dew, especially the heavy
dews Of autumn, unhealthy. One is
liable to inhale parasites which may
fasten on the liver, spleen or other Or
gans, and develop chills and fever. a
man on horseback may escape a disease
that viii attack one on foot, both pass
ing over the same malarious ground.
Hence it Is better TO ride than walk
into a swamp to hunt stock, or for any
purpose. Draining low, wet ground,
Is conducive to health, and therefore to
be commended. 1t viii improve our
climate for cotton, grapes, and other
fruit. An excess Of dampness is very
injurious on many accounts.
Boussingault has endeavored to
the average fall Of dew per
squire yard on his farm in Alsace. At
ter night, when the dew had fallen |
he visited bis meadows on
the banks Of the river Sauer before |
sunrise; there, by the aid Of a sponge,
be soaked up the water over forty. three |
square feet of grass, which he placed |
in a bottle and weighed. In some in
stances it was found to exceed two |
pounds IN weight. Dew and mist con-
tain about the same proportions Of am
nonia and nitric acid; and both are |
favorable to growing plants ike grass,
5urnips and cabbage.
At fourteen degrees Of temperature,
)ne grain Of water saturates a cubic
,ot Of air; but if the air be raised to
,ne hundred degrees, it takes twenty
grains Of water to saturate 1t. These
'aets show how much heat has to do
with the capacity Of air to transport
water from one part Of the globe to
another. At two 2l2 degrees
the air is capable of absorbing q
qua atty of vapor of water equal to its
OWN volume. Imagine every cubic fo;t
# air over an acre Of ground TO the
height Of l coo feet 20 be saturated |
with water at a temperature of 100 de- i
grees, and that a mass Of cold air
should fall upon it sufficient to reduce
the heat to 49 degrees. Every square
foot would receive 5000 grains Of
water in a sudden deluge.
The air and lis phenomena are not
studied. Tyndan says:
The suppression for single summers
night of the vapor Of water contained
n the atmosphere over England land
he proposition holds true for all the
countries IN similar latitudes) would be
accompanied by the destruction Of all
he plants which are killed by frosts.
In the desert Of Sahara, where the
ground is fire and the wind flame, the
odd at night is often very difficult to
support. In this hot country ice is
5een to form in the course Of the
ligbt."
We have the highest authority for
saying that three-fourths of mans
laily food is air; and all know that be
needs to inhale fresh air every minute,
1ight and Gay, SO long as life lasts.
at every breathing, the air that leaves
the lungs contains one hundred times
more 'carboric acid, and therefore car
bon, than it did when it entered the
organs Of respiration. With very lit
tie fuel vital air and water run the hui
man machine. a good engineer will
study to keep it in first rate working
order, avoiding all extremes. All food
must be burnt IN some form in man, or
30 harm as something out Of place.
Breathing fogs and poisons, sleeping in
mists, drinking bad water
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