- When the Neo-Kantians, led by Lange, had modified Kant's hypothesis of a priori forms, and retracted Kant's admission and postulation of things in themselves beyond phenomena and ideas, and that too without proceeding further in the direction of Fichte and the noumenal idealists, there was not enough left of Kant to distinguish him essentially from Hume.
Both of them were intent on forcing the theologians into the daylight, and grudged them any aid they might expect from Kant's postulation of God and immortality to crown the edifice of ethics.
The pamphlet begins by re-stating with reference to sight the general theory that perception of an objective world rests upon an instinctive causal postulation, which even when it misleads still remains to haunt us (instead of being, like errors of reason, open to extirpation by evidence), and proceeds to deal with physiological colour, i.e.
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