THE arguments by which Kant seeks to show that time is not a determination of things in themselves but only a form of perception are, mutatis mutandis, identical with those used in his treatment of space.1 They are, therefore, open to the same criticisms, and need no separate consideration.
Time, however, according to Kant, differs from space in one important respect. It is the form not of outer but of inner sense; in other words, while space is the form under which we perceive things, time is the form under which we perceive ourselves. It is upon this difference that attention must be concentrated. The existence of the difference at all is upon general grounds surprising. For since the arguments by which Kant establishes the character of time as a form of perception run pari passu with those used in the case of space, we should expect time, like space, to be a form under which we perceive things; and, as a matter of fact, it will be found that the only argument used to show that time is the form of inner, as opposed____________________