emperance. Look
around the country, and those who are most exposed, who live in huts
but little superior to the sheds that shelter the farmer's flocks, are
found to be the most healthy and robust. Headaches, liver complaints,
coughs, and a multitude of nervous affections, are almost unknown to
them; not so with those who spend their days and nights in rooms in
which the sashes of the windows are calked, or perchance doubled, to
prevent the keen but healthy air of winter from entering their
apartments. Disease and suffering are their constant companions.

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510. What is said of the ventilation of sleeping-rooms? What would
adequate ventilation prevent? Give a common observation.

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_Illustration._ By many, sleeping apartments twelve feet square and
seven feet high, are considered spacious for two persons, and good
accommodations for four to lodge in. An apartment of this size
contains 1008 cubic feet of air. Allowing ten cubic feet to each
person per minute, two occupants would vitiate the air of the room in
fifty minutes, and four in twenty-five minutes. When lodging-rooms are
not ventilated, we would strongly recommend early rising.

511. _The sick-room, particularly, should be so arranged that the
impure air may escape, and pure air be constantly admitted into the
room._ It is no unusual practice in some communities, when a child or
an adult is sick of an acute disease, to prevent the ingress of pure
air, simply from the apprehension of the attendants, that the patient
will contract a cold. Again, the prevalent custom of several
individuals sitting in the sick-room, particularly when they remain
there for several hours, tends to vitiate the air, and, consequently,
to increase the suffering and danger of the sick person. In fevers or
inflammatory diseases of any kind, let the patient breathe pure air;
for the purer the blood, the greater the power of the system to remove
disease, and the less the liability to contract colds.

_Observation._ Among children, convulsions, or "fits," usually occur
when they are sleeping. In many instances, these are produced by the
impure air which is breathed. To prevent these alarming and
distressing convulsions, the sleeping-room should be ventilated, and
there should be no curtains around the bed, or coverings over the
face, as they produce an effect similar to that experienced when
sleeping in a small, unventilated room. To re