Tag der mündlichen Prüfung 25. Juni 2019 I should describe it rather as an intense interest in the mere variety of living things, the variety that catches the eye of the observer even among those which are very much alike, but which are soon found to differ in several distinct characters […] we became travellers, collectors, and observers, in some of the richest and most interesting portions of the earth; and we thus had forced upon our attention all the strange phenomena of local and geographical distribution