Oenothera Scintillans. 389 



SECOND GENERATION FIRST GENERATION 



O. scintillans 40 % 36 % 



O. Lamarckiana 56 % 60 % 



O. ohlonga 3% 3% 



O. lata and nanella 1 % \ % 



The agreement between the two succeeding genera- 

 tions is as great as can be expected in an experiment of 

 this kind. 



There were four seedparents with 52, 52, 54 and 

 55% scintillans in, respectively 111, 61, 161 and 95 

 seedlings. The ^aH//7/a/z^-producing capacity seems very 

 variable, but the figures would perhaps deviate less if 

 greater numbers had been grown. The deviation seems, 

 however, to lie within the limits of individual varia- 

 bility. 



In 1896 six plants of O. scintillans arose in the main 

 line of the Lamarckiana-family (p. 224 and 385). I 

 succeeded in bringing two of these through the winter 

 and in getting them to flower in 1897. Their pollination 

 was artificial and not disturbed by the agency of insects. 

 The amount of seed set was small, varying from % to 

 2 ccm. per plant : is was sown, separately for each seed 

 parent, in March 1898. 



One seed parent gave rise to 365 seedlings which in- 

 cluded the same types in the same proportion as in the 

 previous experiment.-^ The other yielded a total of only 

 about 200, which was, however, made up quite differ- 

 ently.^ 69 % of the population were scintillans, that is 

 to say twice as much as in the previous experiments. 

 The relative number of ohlonga was also doubled and 

 amounted to 21 %. The number of Laniarckianas was 

 correspondingly low, amounting to no more than 8 %, 



* See the numbers on the lower table on p. 245. 

 ' P. 246. 



