ters, and mingling with the heated air, establishes currents toward
the walls, and gradually finds its way out at the numerous crevices
through which the cold air previously entered. If these are not
sufficient for the purpose, several ventilators should be provided in
distant parts of the room, as already suggested. This simple
arrangement, then, provides for the more even dissemination of heat
through all parts of the room, and thus secures a more uniform
temperature, and, at the same time, provides a purer air for
respiration, contributes greatly to the comfort and health of the
scholars, and fulfills several important conditions which are essential
to the most successful prosecution of their studies, and to the
maintenance and improvement of social and moral, as well as intellectual
and physical health.

By inclosing the stove on three sides in a case of sheet iron, leaving a
space of two or three inches between the case and the stove for an air
chamber, the air will become more perfectly warmed before entering the
room at the top of the case. The best mode, however, of warming and
ventilating large school-houses is by pure air heated in a furnace
placed in the basement. The whole house can in this way be warmed
without any inconvenience to the school from maintaining the fires, on
account of either noise, dust, or smoke. But as this mode of warming can
not be advantageously adopted except in very large schools, it will not
often be found desirable out of cities and large villages.

LIBRARY AND APPARATUS.--I have already said that every school-house
should have a room for recitations, library, and apparatus. In country
districts where but one teacher is employed in a school, it will perhaps
generally be found convenient to conduct the majority of the recitations
in the principal school-room. But even where this practice obtains,
there is still urgent necessity for a room for a library, apparatus, and
other purposes.

Several of the states have carried into successful operation the noble
system of District Libraries. These, in the single state of New York,
already contain nearly two millions of volumes. In some of the new
states the system of Township Libraries has been adopted, which, on some
accounts, is better adapted to a sparse population with limited means.
These, in the State of Michigan, already contain one hundred thousand
volumes. The director of each school district draws from the township
library every