Discusses role of insects in crossing varieties of Lathyrus odoratus and other species.
Comments on Hermann Müller [Die Befruchtung der Blumen (1873)],
and Anton Kerner ["Die Schutzmittel des Pollens", Ber. Naturwiss. Med. Ver. Innsbruck, 3 (1873): 100–68].
Admires FD’s work on anemophilous plants.