Page:Ferrier's Works Volume 3 "Philosophical Remains" (1883 ed.).djvu/402

392 constitute that real objective universe of light and glory in which our hearts rejoice?

We can, perhaps, make this matter still plainer by reverting to our old illustration. Our first exposition of the question was designed to exhibit a general view of the case, through the medium of a dead symbolical figure. This proved nothing, though we imagine that it illustrated much. Our second exposition exhibited the illustration in its application to the living sphere of sensation in general; and this proved little. But we conceive that therein was foreshadowed a certain procedure, which, if it can be shown from experience to be the actual procedure of sensation in detail, will prove all that we are desirous of establishing. We now, then, descend to a more systematic exposition of the process which (so far as our experience goes, and we beg to refer the reader to his own) seems to be involved in the operation of seeing. We dwell chiefly upon the sense of sight, because it is mainly through its ministrations that a real objective universe is given to us. Let the circle A be the whole circuit of vision. We may begin by calling it the eye, the retina, or what we will. Let it be provided with the ordinary complement of sensations—the colours X Y Z. Now, we admit that these sensations cannot be extruded beyond the periphery of vision; and yet we maintain that, unless they be made to fall on the outside of that periphery, they cannot become real objects. How is this difficulty—this contradiction—to be overcome? Nature