"Our first knowledge of the existence and properties of the material world is evidently of a complex nature. It seems to arise from the combined action of several senses, conveying to us the general notion of certain essences, which are solid and extended, or possessed of those properties which characterize material things. Without this general knowledge previously acquired, our various senses, acting individually, could convey to us no definite notion of the properties of external things. A smell, that is a mere odour, for example, might be perceived by us, but would convey nothing more than the sensation simply. It could not communicate the impression of this being a property of an external body, until we had previously acquired a knowledge of the existence of that body, and had come by observation to associate the sensation with the body from which it proceeds. The same holds true of the other senses, and we are thus led at the very first step of our inquiries to a complicated process of mind, without which our mere sensations could convey to us no definite knowledge."[27] [27] Abercrombie. Here, then, we conclude. Let us give thanks and praise to that God who has made us what we are--instruments of countless strings, all in harmony, the music of which reaches the soul, and in the secret recesses of the mind is there analyzed, reflected upon, compared, and stored up as knowledge. We feel, we see, we hear, we smell, we taste, we resist; we are assured of our own individuality; we are conscious of our own existence, and we know that all around is external to our own individuality. That sense of individuality is in the mind, and we have within us the assurance of immortality. Let us look to Him, who is the Saviour from an immortality of despair, that at the day of judgment we may be found clothed in his robe of righteousness, the garment of salvation. CHAPTER IV. OBSERVATIONS ON THE AGENCY OF THE SENSES, RELATIVE TO THE UNION BETWEEN MIND AND MATTER; AND ON THE OCCASIONAL IMPERFECTION OF THE BODILY ORGANS OF THE SENSES, WITH THE RESULTS DEPENDING THEREUPON.