244 



The Pedigree Families. 



scintillans is that the proportions, in which the different 

 forms occur, are by no means low at first, and that they 



cannot be increased by selec- 

 tion. Perfectly definite prin- 

 ciples underlie these propor- 

 tions ; for the behavior of an 

 O. scintillans from one stock is 

 the same as that derived from 

 another. 



Some mutants of O. scin- 

 tillans had a capacity of produ- 

 cing 35-40 % scintillans; and 

 others a capacity of producing 

 70 % or more. Moreover, this 

 capacity seems to be inherited. 

 I first noticed O. scintillans 

 in 1888, in a culture from seeds 

 of the /a/a-family (§7). The 

 plant was biennial : I did not 

 sow its seeds till 1894. In 1895 

 I fertilized some of them 

 (which, it will be seen, flow- 

 ered in their second year) with 

 their own pollen. I treated 14 

 plants in this way, but they set 

 little seed. In 1896 1 raised only 

 400 plants from them as fol- 

 lows : 



68 % O. Lamarckiana 



Fig 



47. Oenothera scintil- 

 lans. Top of an annual plant. 



15 % O. scintillans 

 15 % O. oblong a 

 2 % O. lata 



and one plant of O. nanella. 



