We may say that nothing can be more superficial than this derivation of ideas. The matter itself, the essence, is not touched upon at all. A determination is brought into notice which is contained in a concrete relationship; hence the understanding on the one hand abstracts and on the other establishes conclusions. The basis of this philosophy is merely to be found in the transference of the determinate to the form of universality, but it was just this fundamental essence that we had to explain. As to this Locke confesses of space, for example, that he does not know what it really is.[227] This so-called analysis by Locke of complex conceptions, and his so-called explanation of the same, has, on account of its uncommon clearness and lucidity of expression, found universal acceptance. For what can be clearer than to say that we have the notion of time because we perceive time, if we do not actually see it, and that we conceive of space because we see it? The French have accepted this most readily and they have carried it further still; their _Idéologie_ contains nothing more nor less. γ. When Locke starts by saying that everything is experience and we abstract for ourselves from this experience general conceptions regarding objects and their qualities, he makes a distinction in respect of external qualities which was before this made by Aristotle (De anima, II. 6), and which we likewise met with in Descartes (_supra_, pp. 245, 246). That is to say, Locke distinguishes between primary and secondary qualities; the first pertain to the objects themselves in truth, the others are not real qualities, but are founded on the nature of the organs of sensation. Primary qualities are mechanical, like extension, solidity, figure, movement, rest; these are qualities of the corporeal, just as thought is the quality of the spiritual. But the determinations of our individual feelings such as colours, sounds, smells, taste, etc., are not primary.[228] In Descartes’ case this distinction has however another form, for the second class of these determinations is defined by him in such a way as that they do not constitute the essence of body, while Locke says that they exist for sensation, or fall within existence as it is for consciousness. Locke, however, no doubt reckons figure, etc., as still pertaining to reality, but by so doing nothing is ascertained as to the nature of body. In Locke a difference here appears between the implicit and being ‘for-another,’ in which he declares the moment of ‘for-another’ to be unreal—and yet he sees all truth in the relation of ‘for-another’ only.