lieve a child when
convulsed, carry it into the open air.

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What is said of the size of sleeping-rooms? 511. What is said of the
sick-room? Mention some prevailing customs in reference to these
rooms. What is said of convulsions among children?

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512. _While occupying a room, we are insensible of the gradual
vitiation of the air._ This is the result of the diminished
sensibility of the nervous system, and gradual adaptation of the
organs to blood of a less stimulating character. This condition is
well illustrated in the hibernating animals. We are insensible of the
impure air of unventilated sleeping-rooms, until we leave them for a
walk or ride. If they have been closed, we are made sensible of the
character of the air as soon as we reenter them, for the system has
regained its usual sensibility while inhaling a purer atmosphere.

513. _In the construction of every inhabited room, there should be
adequate means of ventilation, as well as warming._ No room is well
ventilated, unless as much pure air is brought into it as the
occupants vitiate at every respiration. This can be effected by making
an aperture in the ceiling of the room, or by constructing a
ventilating flue in the chimney. This should be in contact with the
flues for the escape of smoke, but separated from them by a thin brick
partition. The hot air in the smoke flues will warm the separating
brick partition, and consequently rarefy the air in the ventilating
flue. Communication from every room in a house should be had to such
flues. The draught of air can be regulated by well-adjusted registers,
which in large rooms should be placed near the floor as well as near
the ceiling.

514. While provision is made for the escape of rarefied impure air, we
should also provide means by which pure air may be constantly admitted
into the room, as the crevices of the doors and windows are not always
sufficient; and, if they should be adequate, air can be introduced in
a more convenient, economical, and appropriate manner. There should be
an aperture opposite the ventilating flue, at or near the floor, to
connect with the outer walls of the building or external air. But if
pure heated air is introduced into the room, it obviates the necessity
of the introduction of the external air.[16]

[16] Mr. Frederick Emerson, of Boston, has devised a simple and
effective apparatus for removing vitiated air fro