We have thus far proceeded, with some certainty, {348} in detecting the component parts of that which we call our "belief in the existence of external objects." We have taken account of the sensation from which is derived the visible idea, of the sensations from which are derived the ideas of position, extension, and figure; and we have explained the intimate combination of those two sets of ideas by association. But these, though the leading sensations and ideas, are not the only ones. There are, besides, the sensations from which we derive the idea of resistance, in all its modifications, from that of air, to that of adamant. There are also sensations which are not common to all objects, but peculiar to some; as smell, peculiar to odorous bodies; taste, to sapid; and sound, to sonorous ones. Now, though the most remarkable case of the associations among those feelings, is that between colour, and extension and figure, they are all blended by association into one idea; which, though in reality a cluster of ideas, affects us in the same manner as if it were a single idea; an idea, the parts of which we detect by an analysis, which it requires some training to be able to make. With the colour of the rose, the size and figure of the rose,--which are the predominant ideas,--I associate the idea of that modification of hardness and softness, which belongs to the rose; its degree of resistance, in short; also its smell, and its taste. These associations have been formed, as other associations are, by repetition. I have had so uniformly the sight, along with the handling, these, along with the smell, and the taste--of the rose, that they are always called up together, and in the closest combination. {349} Now then let us ask, what we mean, when we affirm, that the rose exists. In this meaning are undoubtedly included the above sensations, in a certain order. I see the rose on the garden wall, and I affirm that it exists: that is, along with my present sensation, the sight of the rose, I have the ideas of a certain order of other sensations. These are, first, the idea of distance, that is, the idea of the feelings involved in the act of going to the rose: after this, the idea of the feelings in handling it; then in smelling, then in tasting it; all springing up by association with the sight of the rose. It is said, we believe we should have these sensations. That is, we have the idea of these sensations inseparably united one with the other, and inseparably united with the idea of ourselves as having them. That this alone constitutes belief, in the remarkable case of the association of extension and figure with the sensations of sight, has already been seen; that this alone constitutes it, in many other remarkable cases, will be seen as we proceed; and in no case can it be shewn, that any thing more is included in it.