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One section, and that the introductory section, of the transcendental philosophy, I have purposely omitted, though in strictness not to be insulated or dislocated from the faithful exposition even of that which I have given. It is the doctrine of Space and Time. These profound themes, so confounding to the human understanding, are treated by Kant under two aspects–1st, as Anchauungen, or Intuitions (so the German word is usually translated for want of a better); 2ndly, as forms, a priori, of all our other intuitions. Often have I laughed internally at the characteristic exposure of Kant’s style of thinking–that he, a man of so much worldly sagacity, could think of offering, and of the German scholastic habits, that any modern nation could think of accepting such cabalistical phrases, such a true and very ‘Ignotium per Ignotius,’ in part payment of an explanatory account of Time and Space. Kant repeats these words–as a charm before which all darkness flies; and he supposes continually the case of a man denying his explanations or demanding proofs of them, never once the sole imaginable case–viz. of all men demanding an explanation of these explanations. Deny them! Combat them! How should a man deny, why should he combat, what might, for anything to the contrary appearing, contain a promissory note at two months after date for 100 guineas? No; it will cost a little preliminary work before such explanations will much avail any scheme of philosophy, either for the pro or the con. And yet I do myself really profess to understand the dark words; and a great service it would be to sound philosophy amongst us, if this one word anschauung were adequately unfolded and naturalised (as naturalised it might be) in the English philosophic dictionary, by some full Grecian equivalent. Strange that no man acquainted with German philosophy, should yet have been struck by the fact–or, being struck, should not have felt it important to call public attention to the fact of our inevitable feebleness in a branch of study for which as yet we want the indispensable words. Our feebleness is at once argued by this want, and partly caused. Meantime, as respects the Kantian way of viewing space, by much the most important innovation which it makes upon the old doctrines is–that it considers space as a subjective not an objective aliquid; that is, as having its whole available foundation lying ultimately in ourselves, not in any external or alien tenure. This one distinction, as applied to space, for ever secures (what nothing else can secure or explain) the cogency of geometrical evidence. Whatever is true for any determinations of a space originally included in ourselves, must be true for such determinations for ever, since they cannot become objects of consciousness to us but in and by that very mode of conceiving space, that very form of schematism which originally presented us with these determinations of space, or any whatever. In the uniformity of our own space-conceiving faculty, we have a pledge of the absolute and necessary uniformity (or internal agreement among themselves) of all future or possible determinations of space; because they could not otherwise become to us conceivable forms of space, than by adapting themselves to the known conditions of our conceiving faculty. Here we have the necessity which is indispensable to all geometrical demonstration: it is a necessity founded in our human organ, which cannot admit or conceive a space, unless as preconforming to these original forms or schematisms. Whereas, on the contrary, if space were something objective, and consequently being a separate existence, independent of a human organ, then it is altogether impossible to find any intelligible source of obligation or cogency in the evidence–such as is indispensable to the very nature of geometrical demonstration. Thus we will suppose that a regular demonstration has gradually, from step to step downwards, through a series of propositions–No. 8 resting upon 7, that upon 5, 5 upon 3–at length reduced you to the elementary axiom, that Two straight lines cannot enclose a space. Now, if space be subjective originally–that is to say, founded (as respects us and our geometry) in ourselves–then it is impossible that two such lines can enclose a space, because the possibility of anything whatever relating to the determinations of space is exactly co-extensive with (and exactly expressed by) our power to conceive it. Being thus able to affirm its impossibility universally, we can build a demonstration upon it. But, on the other hypothesis, of space being objective, it is impossible to guess whence we are to draw our proof of the alleged inaptitude in two straight lines for enclosing a space. The most we could say is, that hitherto no instance has been found of an enclosed space circumscribed by two straight lines. It would not do to allege our human inability to conceive, or in imagination to draw, such a circumscription. For, besides that such a mode of argument is exactly the one supposed to have been rejected, it is liable to this unanswerable objection, so long as space is assumed to have an objective existence, viz. that the human inability to conceive such a possibility, only argues (what in fact is often found in other cases) that the objective existence of space–i. e. the existence of space in itself, and in its absolute nature–is far larger than its subjective existence–i. e. than its mode of existing quoad some particular subject. A being more limited than man might be so framed as to be unable to conceive curve lines; but this subjective inaptitude for those determinations of space would not affect the objective reality of curves, or even their subjective reality for a higher intelligence. Thus, on the hypothesis of an objective existence for space, we should be thrown upon an ocean of possibilities, without a test for saying what was–what was not possible. But, on the other hypothesis, having always in the last resort what is subjectively possible or impossible (i. e. what is conceivable or not by us, what can or cannot be drawn or circumscribed by a human imagination), we have the means of demonstration in our power, by having the ultimate appeals in our power to a known uniform test–viz. a known human faculty.