33. In the second book of his Essay, which treats of ideas, he makes the grand distinction between ‘the simple ideas which are all from things themselves, and of which the mind can have no more or other than what are suggested to it,’ and the ‘complex ideas which are the workmanship of the mind.’ (Book II. chap. xii.) In his account of the latter there are some curious cross-divisions, but he finally enumerates them as ideas either of _modes_, _substances_, or _relations_. The character of these ideas he then proceeds to explain in the order given, one after the other, and as if each were independent of the rest; though according to his own statement the idea of mode presupposes that of substance, and the idea of substance involves that of relation. ‘Modes I call such complex ideas, which, however compounded, contain not in them the supposition of subsisting by themselves, but are considered as dependencies on, or affections of, substances; such are the ideas signified by the words ‘triangle,’ ‘gratitude,’ ‘murder,’ &c. Of these there are two sorts. First, there are some which are only variations or different combinations of the same simple idea without the mixture of any other--as a dozen, or score--which are nothing but the ideas of so many distinct units added together; and these I call simple modes, as being contained within the bounds of one simple idea. Secondly, there are others compounded of simple ideas of several kinds, put together to make one complex one; e. g. beauty, ... and these I call _mixed modes_.’ (Book II. chap. xii. secs. 4, 5.) So soon as he comes to speak more in detail of simple modes, he falls into apparent contradiction with his doctrine that, as complex ideas, they are the mere workmanship of the mind. All particular sounds and colours are simple modes of the simple ideas of sound and colour. (Book II. chap, xviii. sees. 3, 4.) Again, the ideas of figure, place, distance, as of all particular figures, places, and distances, are simple modes of the simple idea of space. (Book II. chap, xiii.) To maintain, however, that the ideas of space, sound, or colour _in general_ (as simple ideas) were taken from things themselves, while those of _particular_ spaces, sounds, and colours (as complex ideas) were ‘made by the mind,’ was for Locke impossible. Thus in the very next chapter after that in which he has opposed all complex ideas, those of simple modes included, as made by the mind to all simple ones as taken from things themselves, he speaks of simple modes ‘either _as found in things existing_, or as made by the mind within itself.’ (Book II. chap. xiii. sec. 1.) It was not for Locke to get over this confusion by denying the antithesis between that which the mind ‘makes’ and that which it ‘takes from existing things’ and for the present we must leave it as it stands. We must further note that a mode being considered ‘as an affection of a substance,’ space must be to the particular spaces