The Norfolk post. [volume] (Norfolk, Va.) 1865-1866, 1865-12-15
Rurn,s work on Practical Ventilation :

Burns work on Practical Ventilation:
"Tho one or more openings for the es-
cape of the foul air have their sizes or
areas calculated according to the follow-
ing rule: Multiply the number of horses
the stable is to contain by twelve and
divide the product by forty-three times
the square root of the height In feet from
the ceiling to the floor, and the quotient
is the area of the ventilation tube, or
tubes, In feet"
The average temperature Of the heat
of the bodies of cattle Is about lO0 deg.
This is several degrees higher than the
ordinary temperature of our climate,
hence there must be some natural pro-
vision in the body of the animal to sus-
tain the heat. The air being colder than
the body, its action constantly with
draws heat and has tendency to lower
the temperature. In order to keep up
the supply, there must be some fuel for
the production of the heat. We quote
the opinion of DIR. Playfair 1.-THE fuel
consists Of those ingredients of food from
which nitrogen Is absent; they all con-
tain carbon and the elements OF water.
We know that oxygen Is continually
inhaled in the air we breathe, and that
it is never again expired as such. Elk
pired air consists OF carbonic acid, a gas
composed of carbon and oxygen. In the
body, therefore, the oxygen has united
with carbon; or IL has produced the pe,y
of charcoal In the open air. Now the
heat generated by the combustion of the
carbon in the body must be exactly
equivalent to that produced by burning
the same amount in the atmosphere"
A COW breathes about seventy ounces of
carbonic daily, and from this we calcu-
late that about 9S7, 1856 degrees of heat
are produced In the body every
twenty-four hours. By adopting this
opinion as a correct one, it Is not
difficult to account for the heat
in the animal body. The heat
of the animal body in all ATTITUDES is the
same, while that of climate differs
widely. But Providence has wisely pro-
vided for this apparent difficulty. The
fruits of the trOpic regions contain but
twelve per cent. of carbon, while the
train oil of the Arctic Zone contains
seventy per cent. of the same element.
Each, then, furnishes the body with
quantity of fuel in proportion to the
temperature of the climate. The exter-
nal air regulates the furnace which sup.
plies the body with heat. We must keep
1
the temperature at the same degree
during winter and summer, If it is de-
sired to retain the natural functions in
proper activity. This may be done by
food, which produces heat, or by warmth,
which exerts great influence in reduc-
ing the consumption offood. 1t is evil
dent that warmth is essential to health
and the progress of fattening; but to
prove beneficial, the warmth must be
dry and wholesome. If the air is i'm
pure, all of the benefit is lost, and the
germs of fatal disease are sown. The
difficulty only can be overcome and the
danger averted by system of thorough
ventilation. These facts are the result of
costly experiments, and it is time that
we were learning to profit by them. In
this age of progress and enlightened day
no excuse can be found for bad ventila-
ted stable or dwelling house. The pure
air of Heaven is cheap luxury, and it
requires but little expense to thoroughly
ventilate u building according to the
most approved scientific method.-Th
Country Gentlem NeaOspdpeT.