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INT~ODUCTION  Hypothesis of heterogametism  Equivalence, within strain C, of pollen of Oenothera pratincola f. typica and mut. latifolia. . The Fa and F, generations of the cross mut. formosa from strain E X mut. latifolia from strainc  The Fl and F2 generations of the cross f. typica strain C X mut. formosa strain E.. . . . . . . . The Fl and FZ generations of the cross mut. formosa strain E X f . typica strain E . . . . . . . . The F, and F2 generations of various crosses between f. typica M (the new Mendelian strain) and f . t y p k a of strain C, f . typica of strain E, and Iput. formosa..  Various pedigrees of plants used in crosses.  DISCUSSION.  SUMMARY. ..   . . . . . . . . . . . . . . . . . . . . . . . . . LITERATURE CITED.  APPENDIX-TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 4

A case of Mendelian inheritance complicated by heterogametism and mutation in Oenothera pratincola, by Frieda Cobb.