[2] See Jevons, pp. 61-2; and Mill, Bk. I. ch. iii., init.; and ch. iv., init.
Two Ideas
(a) The notion of “two ideas” has two principal difficulties.
Notion of mental transition pure and simple
(i.) In its simplest shape the notion of “two ideas” involves the great blunder which I explained in Lecture IV. It suggests that the parts of Judgment are separate and successive psychical states, and that the Judgment consists in a change from the one to the other. Herbert Spencer, as I understand him, considers every relation to be apprehended as a mental change or passage from one idea to another. This view would degrade logical connection into mere psychical transition. I do not say that there is no psychical transition in Judgment. I do say that psychical transition is not enough to make a Judgment. The parts of Judgment, as we saw in the last lecture, do not succeed one another separately like the parts of a sentence. The relation between Subject and Predicate is not a relation between mental states, but is itself the content of a single though continuous mental state. Mill has rightly touched on this point. “When I say that fire causes heat, do I mean that my idea of fire causes my idea of heat?” [1] and so on. The fact is that “Fire-causing-heat” is itself the single content or meaning represented in my symbolic idea; it is not a succession of psychical states in my mind, or a passage from the idea of fire to the idea of causing heat.
[1] Logic, Bk. I. ch. V. § I.
{103} Absence of assertion
(ii.) But further, understanding now that the Judgment is composed of a single ideal content, and is not a transition from one mental state to another, there is still a difficulty in the conception that its component elements are nothing but ideas. If the Subject in Judgment is no more than an ideal content, how, by what means, does the Judgment claim to be true of Reality? “The Subject cannot belong to the content or fall within it, for in that case it would be the idea attributed to itself.” [1] If the Subject were only a part of an ideal content it would not claim to be true of Reality, and where it appears to be only an ideal content there is much dispute in what sense the Judgment does claim to be true of Reality. “Violations of a law of nature are impossible.” “The three angles of a triangle are equal to two right angles.” “All trespassers will be prosecuted.” In these Judgments we should find it hard to make out that the Subjects are real things corresponding to our ideas. And yet, if they are not, how can the Judgment attach itself to Reality? This is the difficult question of the distinction between the categorical and the hypothetical Judgment, and we shall have to return to it. In the meantime, we must adhere to our judgment of perception as the true underlying type. The Subject is here not an idea, but is the given reality, this or that, and the Judgment is not a conjunction of two ideas, but is present reality qualified by an idea. We say, “It is very hot,” meaning that heat, the general quality embodied for us in an ideal content, is true of—forms one tissue with—the surroundings which here and now press upon our attention. Or again, “This is red,” {104} i.e. the content of the idea red is what my attention selects and emphasises within the mass of detail presented to it in its own unique focus which the pronoun “this” simply points out as though with the finger. We shall find such a structure underlying all the more artificial forms of Judgment.
[1] Bradley’s Principles of Logic, p. 14.
Two Things