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.