“ Preussen (1827) , in which, as a member of the school of E. W. Hengstenberg, he endeavoured to convince the rationalists that it was their duty voluntarily and at once to withdraw from the national church. ”

“ His eldest son, Heinrich August Hahn (1821–1861) , after studying theology at Breslau and Berlin, became successively Privatdozent at Breslau (1845) , professor ad interim (1846) at Königsberg on the death of Heinrich Hävernick, professor extraordinarius (1851) and professor ordinarius (1860) at Greifswald. ”