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nerve can only be affected by that within it, not by that without it. It is against the above axiom to say, that I feel the stone, meaning thereby that the sensation is outside the organ conversant, less or more, with the very essence of being in the stone. The organ is affected by what is within itself; till the contour of its own states is penetrated, the object might as well be miles, as inches, or fractions of an inch distant. Physical effects lie as content in each organ of sense, and are as localized within it as is the object without it. If, then, these physical changes which accompany perception, sensation, were perceived by the mind, the very object, the source of these, would not thereby be directly known. But these states are not perceived, we know nothing about the states either of the eye, the ear, or tongue, in seeing, hearing, tasting. Sensations enter consciousness, and lose at once their special organic grounds. When we have reached the last physical change in our nervous organism, we have not reached the first thing that the mind is conscious of in sensation. No organ of sensation is revealed by its own sensations, but by other sensations of other organs of which it is made an object. If, then, the mind knows the object in perception, it is not by the movement inward from the object, since this finds change, when from it, as a cause, there arises a nervous affection in an organ of sense; and this again meets with a second inexplicable change, when there is a transfer to consciousness, and the true content of the mind lies within it, divested of physical qualities. "We might as well say, that the first ball is in the second ball moving after concussion, as to say, that the very object of perception, or any portion of it, is in this its latest effect. No, the second and third ball move through a change within themselves; the organ becomes a condition of perception itself distinct through a distinct condition of its own nervous substance.