He accepts the Kantian positions that unity of consciousness combines sensations by a priori synthesis, and that therefore all that natural science knows about matter moving in space is merely phenomena of outer sense; and he agrees with Kant that from these data we could not infer things in themselves by reason.
The relation of noiimena to phenomena in the Kantian system is a most difficult one; and, in view of the fact that the acutest intellects of Europe have been engaged vainly for more than a century in reconciling the various passages on the subject, the safest conclusion is that they are irreconcilable.
The remainder of the year he spent at Zurich, slowly perfecting his thoughts on the fundamental problems left for solution in the Kantian philosophy.
It was not possible that having reached this point he should not press forward and leave the Kantian position.
In this writing, and especially in the Appendix, Jacobi came into contact with the critical philosophy, and subjected the Kantian view of knowledge to searching examination.
But it is not a Kantian view; and it is necessary to correct two confusions of Kant and Hegel, which have been iYnported with Hegelianism by Green and Caird.
Taken for granted the Kantian hypothesis of a sense of sensations requiring synthesis by understanding, and the Kantian conclusion that Nature as known consists of phenomena united by categories as objects of experience, Green argued, in accordance with Kant's first position, that knowledge, in order to unite the manifold of sensations by relations into related phenomena, requires unifying intelligence, or what Kant called synthetic unity of apperception, which cannot itself be sensation, because it arranges sensations; and he argued, in accordance with Kant's second position, that therefore Nature itself as known requires unifying intelligence to constitute the relations of its phenomena, and to make it a connected world of experience.
Secondly, when Wundt comes to the psychical, he naturally infers from his narrow Kantian definition of substance that there is no proof of a substrate over and above all mental operations, and falsely thinks that he has proved that there is no substance mentally operating in the Aristotelian sense.
He felt that any philosophical advance must be based on the Kantian methods.
Philosophic (1796), containing an interpretation of the Kantian Kritik in the manner of Salomon Maimon.