We have already got a long way beyond the impressions with which we started; and yet, if I may trust my own experience, such construction as I have described is direct and immediate. A child of four or five would not only construct as much, but might not improbably go a long way further, and say, "Naughty boy to throw a stone at poor doggie!" It is, I say, direct and immediate, and it implies a wonderful amount of mental activity. Some people seem to imagine that in the simpler forms of perception, as when I see an orange on the table, the mind is as passive as the sensitive plate in a photographer's camera. This surely is not so. It is a false and shallow psychology which teaches it. Just as a light pin-prick may set agoing complex physical activities in the frog, so may comparatively simple visual sensations give rise to complex mental activities in construction and reconstruction. It is to emphasize this mental activity that I have persistently used the terms "construct" and "construction." And I wish to emphasize it still further by saying that without the active and constructive mind no such process of construction or reconstruction is possible or (I speak for myself) conceivable. We might just as well suppose that the frog could leap away on stimulation of a pin-prick in the absence of its complex bodily organization, as that sensation could give rise to construction and reconstruction in the absence of a highly organized mind. We have seen that when a howl suggested the construct dog, that construct was vague and undefined; but when I went to the window and saw the terrier, the construct became particularized and defined. This seems to me the normal order of development: first the vague, general, and indefinite; then the particular, special, and defined. That which is immediately suggested at the bidding of sensations received is always more or less general; it only becomes specialized on further examination physical or mental--first a dog or an orange; then this dog or this orange. The more unfamiliar the object, the more vague and indefinite the construct. The more familiar the object, and the further our examination of it is carried, the more particular and defined the construct. I would, therefore, mark two stages in the process of construction: first, the formation of constructs by immediate association, more or less vague, indefinite, and ill defined; and, secondly, the definition of constructs by examination, by which they are rendered more definite, particular, and special, and supplemented by intelligent inferences.