Brentano’s Logic Lectures

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In order to reconstruct the development of Husserl’s early works and the influences on his position in the 1880s and 1890s I made extensive use of notes of the lectures he attended. At the Husserl-Archives Leuven one can find not only Husserl’s own notes of the mathematics classes he took with Weierstrass and Kronecker in Berlin in the 1870s, but also notebooks recording Brentano’s and Stumpf’s lectures. Even though the notes of Brentano’s lectures are not by Husserl’s own hand, they allow us to see the content of Brentano’s theories that Husserl was exposed to and that forms the background of his early position. These notes were all taken by Eduard Leisching and are preserved at the Husserl-Archives with the following signatures:

  • Y 2 Die elementare Logik und die in ihr nötigen Reformen I
    (these correspond to the first part of Brentano’s manuscript EL 72 kept at the Houghton Library).
  • Y 3 Die elementare Logik und die in ihr nötigen Reformen II
    (corresponding to the second part of EL 72).
  • Y 4 Praktische Philosophie I
    (corresponding to part 1 of Eth 21).
  • Y 5 Praktische Philosophie II
    (corresponding to part 2 of Eth 21).
  • Y 6 Ausgewählte Fragen aus der Psychologie und Ästhetik
    (corresponding to PS 78).

Since I have been using the notes of Brentano’s logic lectures extensively in my assessment of Husserl’s early position, I will be publishing Y 2 and 3 as an appendix to my book. The text will be based on a transcription that Karl Schuhmann gave me already when I was still working on my MA thesis. This will be the first substantial publication of materials from Brentano’s logic lectures from the mid 1880s (the other logic lectures, in manuscript EL 80, seem to be of much earlier date). I hope that this material will be of assistance to researchers interested not only in early Husserl, Brentano, and the School of Brentano in general, but also more broadly in the development of the philosophy of logic in the nineteenth century.

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