Contents: Introduction,Evolutionary factors,Characters and distribution of the oenotheras,The Cultural history of oenothera,1614-1860,Description of the mutation phenomena in Oe.Lamarckiana,Mutations in other oenotheras,The cytological basis of the mutation phenomena,Hybridisation and hereditary behaviour,The relation between hybridisation and mutation,A general theory of mutations,The evolutionary significance of mutations,Bibliograpy,Index.
