8. _On the Volcanoes in the Moon_ (1785); _On the Influence of the Moon on the Weather_ (1794). The second of these contains a remarkable discussion of the relation between the centre of the moon's figure and its centre of gravity. From the difference between these Kant is led to conjecture that the climatic conditions of the side of the moon turned from us must be altogether unlike those of the face presented to us. His views have been restated by Hansen. 9. _Lectures on Physical Geography_ (1822): published from notes of Kant's lectures, with the approval of the author. Consideration of these works is sufficient to show that Kant's mastery of the science of his time was complete and thorough, and that his philosophy is to be dealt with as having throughout a reference to general scientific conceptions. For more detailed treatment of his importance in science, reference may be made to Zollner's essay on "Kant and his Merits on Natural Science" contained in the work on the _Nature of Comets_ (pp. 426-484); to Dietrich, _Kant and Newton_; Schultze, _Kant and Darwin_; Reuschle's careful analysis of the scientific works in the _Deutsche Vierteljahrs-Schrift_ (1868); W. Hastie's introduction to _Kant's Cosmogony_ (1900), which summarizes criticism to that date; and articles in _Kant-Studien_ (1896 foll.). The notice of the philosophical writings of Kant need not be more than bibliographical, as in the account of his philosophy it will be necessary to consider at some length the successive stages in the development of his thought. Arranged chronologically these works are as follows:-- 1755. _Principiorum primorum cognitionis metaphysicae novae dilucidatio._ 1756. _Metaphysicae cum geometria junctae usus in philosophia naturali, cujus specimen I. continet monadologiam physicam._ 1762. _Die falsche Spitzfindigkeit der vier syllogistischen Figuren_, "The False Subtlety of the Four Syllogistic Figures" (trans. T. K. Abbott, _Kant's Introduction to Logic and his Essay on the Mistaken Subtilty of the Figures_, 1885). 1763. _Versuch den Begriff der negativen Grossen in die Weltweisheit einzufuhren_, "Attempt to introduce the Notion of Negative Quantities into Philosophy." 1763. _Der einzig mogliche Beweisgrund zu einer Demonstration des Daseins Gottes_, "The only possible Foundation for a Demonstration of the Existence of God." 1764. _Beobachtungen uber das Gefuhl des Schonen und Erhabenen_ (Riga, 1771; Konigsberg, 1776). 1764. _Untersuchung uber die Deutlichkeit der Grundsatze der naturlichen Theologie und Moral_, "Essay on the Evidence (Clearness) of the Fundamental Propositions of Natural Theology and Ethics." 1766. _Traume eines Geistersehers, erlautert durch Traume der Metaphysik_, "Dreams of a Ghost-seer (or Clairvoyant), explained by the Dreams of Metaphysic" (Eng. trans. E. F. Goerwitz, with introd. by F. Sewall, 1900).