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665 use of the term too wide, 2; simple and complex, 2 (cf. 13); simple ideas exactly represent simple impressions, but complex ideas and impressions do not exactly correspond, 3 (cf. 231); impressions causes of ideas, because constantly conjoined and prior, 5; an exception to this in the case of a series, 6; primary and secondary, 6; give rise to impressions of reflexion, 7 (cf. 165, 289); the question of innate ideas the same as that of the precedence of impressions, 7, 158, its importance, 33, 74, 161; of memory more lively than those of imagination, 8 f., the former 'equivalent to impressions,' 82; the idea of an idea, 106; obscure as compared with impressions, 33; obscurity of; our own fault and remediable, 72; the mind has the command over all its ideas, 624, 629; the fact that we talk and reason about an idea no proof that we have it, 62 (cf. 32); not infinitely divisible, 27, 52; every lively idea agreeable, 353; attended with some emotion, 373, 375, 393.

§ 2. A. Association of (q.v.), 10; on three guiding principles, resemblance, contiguity, and causation (q.v.), 11 f. (cf. 92), 283 f., 305 f,; physiological explanation of, 60.

B. Associated with impressions and enlivened by them, 98, 101 (cf. 317); associations of ideas and impressions assist one another, e.g. in double relation of impressions and ideas, 284, 286, 380; association of, gives rise to no new impressions, only modifies the ideas, and so produces no passions, 305; law of transition between, viz. from faint to lively, from remote to contiguous, 339; hence easy to pass from idea of another person to idea of self, but not conversely, except in case of sympathy (q.v.), 340; law of ideas opposed to that of impressions, 341-2 (cf. 283), but yields to it when there is a conflict, 344-5; an idea converted into an impression in sympathy by relation, 317 f.; never admit of a total union: can only be conjoined, not mixed, while impressions and passions can be mixed, 366; related ideas liable to be confused (v. error), 60, 62, 203, 264; related in animals as well as men, 327.

§ 3. A. Reasoning, judgment, conception, and belief (q.v.), only particular ways of conceiving ideas, 97 n (cf. 164), reasoning merely on operation of our thoughts or ideas, and nothing ever enters into our conclusions but ideas or fainter conceptions, 625 (cf. 73, 183).

B. Abstract relations of, opposed to experienced relations of objects, 414, 463; the world of ideas the province of demonstration (q.v.); the world of realities that of the will, 414; truth a proportion of ideas considered as such, i.e. not as representative, 448, 458; four demonstrable relations, 464; is morality a demonstrable relation? 456, 463. 496.

C. Truth belongs only to ideas as representative, =agreement of ideas considered as copies with those objects which they represent, 415; =the conformity of our ideas of objects to their real existence,