MENDELIAN INHERITANCE IN OENOTHERA PRATINCOLA 15 



were carried on unseen until their appearance in the zygote was made 

 possible by the removal, through hybridization, of inhibiting Mendelian 

 factors. 



LITERATURE CITED 



BARTLETT, H. H., 1915 a Additional evidence of mutation in Oenothera. Bot. Gaz. 59: 81- 



123. 

 1915 b Mass mutation in Oenothera pratincola. Bot. Gaz. 60: 425-456. 



COBB, FRIEDA, and BARTLETT, H. H., 1919 On Mendelian inheritance in crosses between 

 mass-mutating and non-mass-mutating strains of Oenothera pratincola. Jour. Wash- 

 ington Acad. Sci. 9: 462-483. 



DAVIS, B. M., 1915 A method of obtaining complete germination of seeds in Oenothera and of 

 recording the residue of sterile seed-like structures. Proc. Nation. Acad. Sci. 1: 360- 

 363. 



DE VRIES, HUGO, 1901, 1903 Die Mutations-Theorie. 2 vols., xii + 648 pp.; xiv + 752 pp. 



Leipzig: Veit & Co. 



1915 a The coefficient of mutation in Oenothera biennis L. Bot. Gaz. 59: 169-196. 

 1915 b Oenothera gigas nanella, a Mendelian mutant. Bot. Gaz. 60: 337-345. 



MORGAN, T. H., 1918 Concerning the mutation theory. Sci. Monthly 6: 385-405. 



MULLER, H. J., 1918 Genetic variability, twin hybrids and constant hybrids, in a case of bal- 

 anced lethal factors. Genetics 3: 422-499. 



APPENDIX-TABLES 



Explanations applying to all of the tables 



In table 1, all plants not otherwise designated were f. typica. 



F. typica M is the synthetic, Mendelian strain of Oenothera pratincola which 

 arises from the cross mut. formosa X f. typica C (or other form with equivalent 

 pollen) v 



The numbers in columns headed "Key number" refer to corresponding 

 numbers in table 1. The numbers in columns headed "Parent plant" are the 

 numbers of the individual plants in the progenies resulting from the crosses or 

 self-pollinations recorded in table 1. 



* indicates that the seeds sown were from a single capsule. 



t indicates that seeds from two or more capsules were sown together. 



All of the flat-leaved types mentioned in analyses of cultures are regularly 

 thrown by self-pollinated f. typica C, and some of them also by f. typica E. 

 All of the revolute-leaved types mentioned are regularly thrown by f. typica E 

 and by mut. formosa. 



Types other than f. typica, mut. latifolia, and mut. formosa mentioned in the 

 following tables are: 



Mut. albicans (BARTLETT 1915 b, page 449). 



Mut. angustifolia (BARTLETT 1915 b, page 438). 



Mut. dimorpha, an undescribed mutation. 



Mut. ericacea, an undescribed mutation. 



Mut. fallax, an undescribed mutation, as a seedling very much like mut. 

 nummularia, and thrown by the same strains. 



GENETICS 6 : Ja 1921 



