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94 of my consciousness of my own states, and in this consciousness there is always a conclusion drawn from the effect in myself to a cause out of myself.

Spirit. Thou art quickly vanquished; and I must now myself carry forward, in thy place, the controversy against myself. My argument can only apply to those cases in which an actual and deliberate estimate of the size, distance, and position of objects takes place, and in which thou art conscious of making such an estimate. Thou wilt however admit that this is by no means the common case, and that for the most part thou rather becomest conscious of the size, distance, &c. of an object at the very same undivided moment in which thou becomest conscious of the object itself.

I. When once we learn to estimate the distances of objects by the strength of the impression, the rapidity of this judgment is merely the consequence of its frequent exercise. I have learnt, by a lifelong experience, rapidly to observe the strength of the impression and thereby to estimate the distance. My present conception is founded upon a combination, formerly made, of sensation, intuition, and previous judgments; although at the moment I am conscious only of the present conception. I no longer apprehend generally red, green, or the like, out of myself, but a red or a green at this, that, or the other distance; but this last addition is merely a renewal of a judgment formerly arrived at by deliberate reflection.

Spirit. Has it not then, at length, become clear to thee whether thou discoverest the existence of things out of thyself by intuition, or by reasoning, or both,—and in how far by each of these?

I. Perfectly; and I believe that I have now attained