Influenced by the German biologist and philosopher Hans Driesch, he became interested in philosophy of life and in a large work The History of Biological Theories (in German 1905–1909, in English 1930; reprint in 1988) he criticized the evolutionism of the 19th century.
Rahm Emanuel | Emanuel Lasker | Emanuel Swedenborg | Emanuel Leutze | Maximilian II Emanuel, Elector of Bavaria | Emanuel Ungaro | Emanuel Ax | Emanuel Schegloff | Bogislav Friedrich Emanuel von Tauentzien | Philipp Emanuel von Fellenberg | Emanuel Litvinoff | Emanuel Hahn | Emanuel Feuermann | Emanuel Cleaver | Emanuel Bowen | Carl Philipp Emanuel Bach | Walter Emanuel Jones | Emanuel Wynn | Emanuel United Church of Christ Cemetery | Emanuel Steward | Emanuel Schikaneder | Emanuel Mendel | Emanuel ('''Manny''') Rosenfeld | Emanuel L. Philipp | Emanuel Kiriakou | Emanuel Geibel | Emanuel Gat | Emanuel | ''Washington Rallying the Troops at Monmouth'' by Emanuel Leutze | Quinn Emanuel Urquhart & Sullivan |