igisl 



BARTLETT— MUTATION IN OENOTHERA 



lOS 



Data in regard to the frequency of mut. nummularia in all 

 the strains of 0. pratincola except Lexington E are given in tables 

 II-XI, and are summarized in table XII. Lexington E yielded 

 striking mutations in both Fi and F^ generations, but they con- 

 stituted an entirely different series of forms from those which were 

 obtained from the other strains. In several respects the mutation 

 phenomena presented by Lexington E were unique. It will be 

 necessary, therefore, to defer an account of this strain until next 

 year. 



It will be noticed from the tables that a large number of seeds 

 were planted capsule by capsule. The variation in number of 

 seeds per capsule appears greater than it should, for in many 

 cases the capsules had dehisced and lost part of their contents. In 

 general, a capsule of 0. pratincola contains 200-300 seeds. 



TABLE II 

 Analysis or Fi seedling cultures of "Lexington C" 



Culture 



Seeds 

 planted 



Total plants 



Typical 



Mut. nummularia 



Other muts. and 

 suspected muts. 



2 . . . 



3 ■•■ 

 4 



5 .... 



6 .... 



7 .... 



8 .... 



9 .... 



10 . . . 



11 . . . 



12 . . , 



13 •• 



14 .. , 



15 ... 



16 ... 



17 ... 



18 ... 



19 ... 



20 . . . 



21 . . , 

 Total 



1000 



^33* 



130* 



116* 



88* 



I2S* 



162* 

 164* 

 237* 

 237* 

 65* 

 217* 

 200 

 200 

 147* 

 200 

 200 



200 

 200 



4,221 



720 



lOI 



117 



III 



21 



20 



152 



143 



172 



223 



35 



147 



156 



154 



96 



60 



iSS 



130 

 112 



2,923 



711 



93 

 116 

 106 

 20 

 20 

 149 

 140 



165 

 211 



35 

 143 

 153 

 152 

 93 

 58 

 152 



95 



109 



4 (nos. 10, II, 



17, and 21) 

 o 

 o 



I (no. 123) 

 o 



1 (no. 136) 

 o 



o 

 o 

 o 



2 (nos. 150 and 



151 

 o 

 2 (nos. 156 and 



160) 

 I (no. 162) 



2,845 



67 



* Indicates seeds firom. the same capsule. 



