_
obedience can be exacted. The teacher must follow up the plan after a
few days by other measures for those pupils who will not yield to such
inducements as these. Upon this subject, however, I shall speak more
particularly at a future time.

In my own school it required two or three weeks to exclude whispering
and communication by signs. The period necessary to effect the
revolution will be longer or shorter, according to the circumstances of
the school and the dexterity of the teacher; and, after all, the teacher
must not hope _entirely_ to exclude it. Approximation to excellence is
all that we can expect; for unprincipled and deceiving characters will
perhaps always be found, and no system whatever can prevent their
existence. Proper treatment may indeed be the means of their
reformation, but before this process has arrived at a successful result,
others similar in character will have entered the school, so that the
teacher can never expect perfection in the operation of any of his
plans.

I found so much relief from the change which this plan introduced, that
I soon took measures for rendering it permanent; and though I am not
much in favor of efforts to bring all teachers and all schools to the
same plans, this principle of _whispering at limited and prescribed
times alone_ seems to me well suited to universal adoption.

The following simple apparatus has been used in several schools where
this principle has been adopted. A drawing and description of it is
inserted here, as by this means some teachers, who may like to try the
course here recommended, may be saved the time and trouble of contriving
something of the kind themselves.

The figure _a a a a_ on the next page is a board about 18 inches by 12,
to which the other parts of the apparatus are to be attached, and which
is to be secured to the wall at the height of about 8 feet, and _b c d
c_ is a plate of tin or brass, 8 inches by 12, of the form represented
in the drawing. At _c c_, the lower extremities of the parts at the
sides, the metal is bent round, so as to clasp a wire which runs from
_c_ to _c_, the ends of which wire are bent at right angles, and run
into the board. The plate will consequently turn on this axis as on a
hinge. At the top of the plate, _d_, a small projection of the tin turns
inward, and to this one end of the cord, _m m_, is attached. This cord
passes back from _d_ to a small pulley at the upper part of the board,
and at the low