102. Now ‘body’ in this theory is by no means outside consciousness. It is emphatically ‘in the mind,’ a ‘nominal essence,’ determined by the relation which the theory assigns to it, and which, like every relation according to Locke, is a ‘thing of the mind.’ This relation is that of outwardness to other bodies, and among these to the sensitive body through which we receive ‘ideas of sensation’--a body which, on its side, as determined by the relation, has its essence from the mind. It is, then, not as the unknown opposite of the mind, but as determined by an intelligible relation which the mind constitutes, and of which the members are each ‘nominal essences,’ that body is outward to the sensitive subject. But to Locke, substituting for body as a nominal essence body as the unknown thing in itself, and identifying the sensitive subject with the mind, outwardness in the above sense--an outwardness constituted by the mind--becomes outwardness to the mind of an unknown opposite of the mind. Solidity, then, and the properties which its definition involves (and it involves all the ‘primary qualities’), become something wholly alien to the mind, which ‘would exist without any sensible being to perceive them.’ As such, they do duty as a real essence, when the opposition of this to everything in the mind has to be asserted. Yet must they be in some sort ideas, for of these alone (as Locke fully admits) can we think and speak; and if ideas, in the mind. How is this contradiction to be overcome? By the notion that though not in or of the mind, they yet copy themselves upon it in virtue of an impulse in body, correlative to that resistance of which touch conveys the idea. (Book II. chap. viii. sec. 11). [1] This explanation, however, is derived from the equivocation between the two meanings of mind and body respectively. The problem to be explained is the relation between the mind and that which is only qualified as the negation of mind; and the explanation is found in a relation, only existing for the mind, between a sensitive and a non-sensitive body. [1] Cf. also the passage from Book II. chap. xiii. sec. 11, quoted above, paragraph 101, note [1]. Rationale of these contradictions.