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W. JAMES images for the identity-theory, and too many for the pro- jection-theory. The partisans of the projection-theory, beginning with Aguilonius, have always explained double images as the result of an erroneous judgment of the distance of the object, the images of the latter being projected by the imagination along the two lines of visible direction either nearer or farther than the point of intersection of the latter. A diagram will make this clear. 3. O being the point looked at, M being an object farther, and N an object nearer than it, will send the lines of visible