The idea of space is conveyed to the mind by two senses, the sight and touch; nor does any thing ever appear extended, that is not either visible or tangible. That compound impression, which represents extension, consists of several lesser impressions, that are indivisible to the eye or feeling, and may be called impressions of atoms or corpuscles endowed with colour and solidity. But this is not all. 'Tis not only requisite that these atoms should be coloured or tangible, in order to discover themselves to our senses, 'tis also necessary we should preserve the idea of their colour or tangibility, in order to comprehend them by our imagination. There is nothing but the idea of their colour or tangibility which can render them conceivable by the mind. Upon the removal of the ideas of these sensible qualities they are utterly annihilated to the thought or imagination. Now, such as the parts are, such is the whole. If a point be not considered as coloured or tangible, it can convey to us no idea; and consequently the idea of extension, which is composed of the ideas of these points, can never possibly exist: but if the idea of extension really can exist, as we are conscious it does, its parts must also exist; and in order to that, must be considered as coloured or tangible. We have therefore no idea of space or extension, but when we regard it as an object either of our sight or feeling. The same reasoning will prove, that the indivisible moments of time must be filled with some real object or existence, whose succession forms the duration, and makes it be conceivable by the mind. [3] Mr Locke. [4] Sect. 5. SECTION IV. OBJECTIONS ANSWERED. Our system concerning space and time consists of two parts, which are intimately connected together. The first depends on this chain of reasoning. The capacity of the mind is not infinite, consequently no idea of extension or duration consists of an infinite number of parts or inferior ideas, but of a finite number, and these simple and indivisible: 'tis therefore possible for space and time to exist conformable to this idea: and if it be possible, 'tis certain they actually do exist conformable to it, since their infinite divisibility is utterly impossible and contradictory.