417 417
(a)(b)Figur e 15.1 Koelreuter’s cross between Nicotiana rustica (left) and Nicotiana paniculata (rig ht).
A. Comparison of the flowers of N. rustica (left) and N. paniculata (right). B. Lengths or widths in
inches of the floral parts of the parental stock versus the hybrid.
From: Olby, R. C. (1966), Joseph Koelreuter, 1733–1806, in R. C. Olby, ed., Late Eighteenth Century European
Scientists. Pergamon Press, Oxford, pp. 50–51.