Classes in logic are not only represented by circles with a hard firm outline, whereas they have no such definite limits, but also there is a constant disposition to think of negative terms as if they represented positive classes. With words just as with numbers and abstract forms there are definite phases of human development. There is, you know, with regard to number, the phase when man can barely count at all, or counts in perfect good faith and sanity upon his fingers. Then there is the phase when he is struggling with the development of number, when he begins to elaborate all sorts of ideas about numbers, until at last he develops complex superstitions about perfect numbers and imperfect numbers, about threes and sevens and the like. The same is the case with abstracted forms, and even to-day we are scarcely more than heads out of the vast subtle muddle of thinking about spheres and ideally perfect forms and so on, that was the price of this little necessary step to clear thinking. You know better than I do how large a part numerical and geometrical magic, numerical and geometrical philosophy has played in the history of the mind. And the whole apparatus of language and mental communication is beset with like dangers. The language of the savage is, I suppose, purely positive; the thing has a name, the name has a thing. This indeed is the tradition of language, and to-day even, we, when we hear a name, are predisposed--and sometimes it is a very vicious disposition--to imagine forthwith something answering to the name. We are disposed, as an incurable mental vice, to accumulate intension in terms. If I say to you Wodget or Crump, you find yourself passing over the fact that these are nothings, these are, so to speak, mere blankety blanks, and trying to think what sort of thing a Wodget or a Crump may be. And where this disposition has come in, in its most alluring guise, is in the case of negative terms. Our instrument of knowledge persists in handling even such openly negative terms as the Absolute, the Infinite, as though they were real existences, and when the negative element is ever so little disguised, as it is in such a word as Omniscience, then the illusion of positive reality may be complete.