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Born 1830. Tutor in 1845. Professor in 1845. Although the online source from which this article comes verbatim(+/-) has those years, fr.WP has not the second 1845 but 1860 --SilasW (talk) 17:31, 3 November 2010 (UTC)[reply]
1855 is correct, see Historical Dictionary of Switzerland. -Vaudois133 (talk) 16:55, 20 June 2019 (UTC)[reply]
