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record the motions of the arms and fingers. By movement we repeat at pleasure the problems offered by extension, and secure varying conditions for their solution.

In this growth of the mind into the possession and handling of its instruments, into the rudiments of experimental knowledge, the appropriate regulative ideas are present doing their work, though of course they are unrecognized by the mind, as is the fact of sensation itself in the first feelings, or the fact of judgment in the early perceptions of likeness. It is the substance of experience, not its forms, the facts of experience, not its conditions, that occupy the attention. Experience is not for this reason destitute of form, or without conditions. The first when and where, though as yet unanalyzed, involve time and space, as certainly as the last.

(5) One of the great labors of childhood is ready to follow the steps now taken, the conversion of sensations into perceptions by virtue of associative judgments. This change takes place chiefly in seeing and hearing, though the movement reaches the other senses somewhat, and, in the absence of the higher senses, may thoroughly transform them. This remarkable conversion takes place so early in life and so rapidly that we may readily overlook its' extent. The ear and the eye, though more frequently indicating instantly the directions and relations of objects, obscuring the judgments of the mind by their rapidity, are sometimes- so slow and uncertain in their decisions as to make the presence of their reflective processes conspicuous. We frequently have occasion to listen attentively in order to judge of the character and distance and nature of an unfamiliar sound. An object seen across the water deceives us, is farther off than we think it to be. Our estimates of the height of a cloud are very uncertain,; or of the size of unfamiliar objects, especially when our ordinary standards of measurements