It may be said perhaps, that not the sensation excited by any of the parts of an object separately, but the sum of our sensations, excited by all the parts, produces our idea of the whole. But it is not possible that in a given number of impressions, where the mind never has perception of more than a single part, there should be contained notwithstanding a view of the whole at once. For as a single part cannot of itself represent the whole object, so neither can this part by being actually joined to others, which by the supposition are never perceived to be joined with it, produce that idea, any more than if those other parts had no existence. If the impression of the parts of an object, absolutely and individually considered, were the same thing as the idea of the object, any number of actual impressions, arranged in any manner whatever, would necessarily be the same object. But this is contrary to all fact. For then a curve line, consisting of the same number of points, would not be distinguishable from a straight one, nor a square from a triangle of the same dimensions, and so on. In a being endued only with a power of sensation, and supposed to be simple and undivided, there could be no room for more than an individual impression at once. Our sensations must always succeed each other. One thought must have completely passed away, before another could supply its place. Our ideas would leave no traces of themselves, like the bubbles that rise and disappear on the water, or the snow that melts as it falls. There would be nothing in their fugitive, momentary existence to bind them together. Ere we could stop to compare any one impression with any other, it would be lost for ever in the dark abyss of time. Nothing could be connected with any thing else, either coexisting with it, or going before or after it. If on the other hand, we suppose any merely sentient being to be extended and compounded, or to be capable of receiving more than one impression at once, we shall yet gain little by it. Such a sentient being will be nothing but a number of distinct sentient beings. For as in the former instance, no two impressions could co-exist together, so in the latter, though they existed together, there could be no sort of communication between them. They would be absolutely cut off from and exclusive of each other. The mind in attending to any one must be wholly absorbed by it, and insensible of the rest. Our sensations would to every rational purpose be placed as completely out of the sphere of each other’s consciousness, as if they were parcel of another intellect, or floated in the region of the moon. That any number of detached, unconnected, actual sensations, impressed on different sentient beings, would not of themselves imply a conception of any one entire object is what every one is ready to grant:—it would be equally clear, that this idea could not arise from the impression of the different parts of an