.

[Illustration: _Plan of a School-house for fifty-six Scholars._

Size, 30 by 40 feet.

Scale, 10 feet to the inch.]

D D, doors. E E, entries lighted over outer doors, one for the boys
and the other for the girls. T, teacher's platform and desk. R L,
room for recitation, library, and apparatus, which may be entered by
a single door, as represented in the plan, or by two, as in the
following plan. S S, stoves with air-tubes beneath. K K, aisles four
feet wide--the remaining aisles are each two feet wide. _c v_,
chimneys and ventilators. I I, recitation seats. B B, black-board,
made by giving the wall a colored hard finish. G H, seats and desks,
four feet in length, constructed as represented on the next page.
The seat and desk may be made together, and instead of being
fastened permanently to the floor, attached in front by a strap
hinge, which will admit of their being turned forward while sweeping
under and behind them.

[Illustration: _Primary and Intermediate Department, on first floor._

Size, 36 by 64 feet.

Scale, 12 feet to the inch.]

A, entrance for boys to the High School. C, entrance for girls to
the High School. P, entrance for boys to the Primary and
Intermediate Departments. Q, entrance for girls to the same. D D,
doors. W W, windows. T, teacher's platform and desk. G H, desk and
seat for two scholars, a section of which is represented at X, in
the Primary Department. I I, recitation seats. B B, black-boards. S
S, stoves, with air-tubes beneath. _c v_, chimney and ventilator. R,
room for recitation library, apparatus, and other purposes.

[Illustration: _High School, or Third Department, on second floor._]

A, entrance for the boys, through the entry below. C, entrance for
the girls. G H, desk and seat: aisles from two to three feet wide. D
D, doors. W W, windows. S S, stoves. _c v_, chimney and ventilator.
T, teacher's platform. R, recitation-room. I I, recitation seats in
principal room. B B, black-board: as a substitute for the common
painted board, a portion of the wall, covered with hard finish, may
be painted black; or, what is better, the hard finish itself may be
colored before it is put on, by mixing with it lamp-black, wet up
with alcohol or sour beer.

VENTILATION OF SCHOOL-HOUSES.--We have already seen that in a
school-room occupied by forty-five person