 After publishing his work on the perception of color (Marty 1879), Marty became a professor in Prague, where some of his students (such as Oskar Kraus, Alfred Kastil, Hugo Bergmann, and even for a brief period Franz Kafka) also came to be followers of Brentano. In the following year Brentano had to resign as a professor in Vienna because he got married. Since he had earlier received holy orders, including of course the vow of celibacy, his marriage was not acceptable in Austria, where there was no institution of civil marriage and Catholicism was dominant. Nevertheless, Brentano continued to lecture in Vienna until his full resignation in 1895. In the later nineteenth century and early in the twentieth century Brentano developed a philosophical standpoint which Marty found objectionable. This was the view that only real things are conceivable and only real things can exist. Brentano therefore spent much of his philosophical effort during his retirement analyzing away all the talk of irrealia, which he had accepted in his Vienna period. Marty, by contrast, retained the irrealia, though with certain revisions in light of his correspondence with Brentano. Marty also corresponded with other students of Brentano, such as Stumpf and Edmund Husserl (see Schuhmann [ed.] 1994, 69–96), and of course with others in the wider philosophical and scientific community. Still the fact remains that Brentano was the dominant philosopher in his career.