Judgment as to Weight––Letters, book parcels, an apple, an orange, a vegetable marrow, fifty things in the course of the day, give opportunities for this kind of object teaching; i.e. the practice of forcing judgments as to the relative and absolute weight of objects by the irresistance, that is their opposition to our muscular force, perceived by our sense of touch. By degrees the children are trained to observe that the relative weights of objects depend upon their relative density, and are introduced to the fact that we have a standard of weight.
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