is atque Intelligibilis Forma et Principiis_, leaves
unchallenged the possibility of a knowledge of things in themselves and of
God, thus showing that its author has abandoned the skepticism maintained
in the _Dreams of a Ghost-seer_, and has turned anew to dogmatic
rationalism, whose final overthrow required another swing in the direction
of skeptical empiricism. In regard to the progress of this latter phase
of opinion, the letters to M. Herz are almost the only, though not very
valuable, source of information.

[Footnote 1: _New Theory of Motion and Rest_, 1758; _On the First Ground of
the Distinction of Positions in Space_, 1768; besides several of the works
mentioned above.]

The _Critique of Pure Reason_ appeared in 1781, much later than Kant had
hoped when he began a work on "The Limits of Sensibility and Reason," and a
second, altered edition in 1787.[1] After the _Prolegomena to every Future
Metaphysic which may present itself as Science_, 1783, had given a popular
form to the critical doctrine of knowledge, it was followed by the critical
philosophy of ethics in the _Foundation of the Metaphysics of Ethics_,
1785, and the _Critique of Practical Reason_, 1788; by the critical
aesthetics and teleology in the _Critique of Judgment_, 1790; and by the
critical philosophy of religion in _Religion within the Limits of Reason
Only_, 1793[2] (consisting of four essays, of which the first, "Of Radical
Evil," had already appeared in the _Berliner Monatsschrift_ in 1792). The
_Metaphysical Elements of Natural Science_, 1786, and the _Metaphysics
of Ethics_, 1797 (in two parts, "Metaphysical Elements of the Theory of
Right," and "Metaphysical Elements of the Theory of Virtue "), are devoted
to the development of the system. The year 1798 brought two more larger
works, the _Conflict of the Faculties_ and the _Anthropology_. Of the
reviews, that on Herder's _Ideen_ maybe mentioned, and among the minor
essays, the following: _Idea for a Universal History in a Cosmopolitan
Sense, Answer to the Question: What is Illumination f_ both in 1784;
_What does it mean to Orient oneself in Thought_? 1786; _On the Use of
Teleological Principles in Philosophy_, 1788; _On a Discovery according to
which all Recent Criticism of Pure Reason is to be superseded by a Previous
One_, 1790; _On the Progress of Metaphysics since the Time of Wolff; On
Philosophy in General, The End of all Things_, 1794; _On Everlasting
Peace_, 1795. Kant's _Logic_ w