AntirrhinuiJi Ma jus Striatum. 135 



type. I have not yet observed this to happen by means 

 of bud-variation. 



6. Antirrhinuui uiajus lutcuiii does not arise from 

 these striped and red races. 



7. If we compare the forms which we have been 

 considering,^ with the half races and middle races which 

 we distinguished in § 3, p. 18, we hnd that between the 

 two constant elementary species ( the systematic species, 

 A. uiajus and the systematic variety, A. ma jus lutcum) 

 there exist two intermediate forms which are perfectly 

 distinct from these two, but not from one another. We 

 can distinguish, 



a. Ilie eversporting variety,/], majus lutcum, striatum, 

 ^^•ith striped flowers and a high degree of iluctuating 

 variability, from which a faintly striped and a broadly 

 striped race can be raised by selection. These three races 

 however merge continuously into one another. 



b. The atavistic type in this race is uniformly red, but 

 with incomplete inheritance and gives rise, when self- 

 fertilized, in each generation to about 25% striped indi- 

 viduals besides the red ones. 



In contrast with the previously described cases, the 

 transition from the atavistic type to the eversporting 

 variety and the reverse process here occur every vear 

 but always with a slight gap. The red type arises from 

 the striped race by seeds and by buds, but the striped 

 race has, hitherto, arisen from the atavistic type only by 



^The mode of inheritance in the coarsely striped individuals will 

 have to be more closely investigated ; so also must sectorial varia- 

 tion. Moreover the experiment should be repeated with other striped 

 varieties, and the spotted forms investigated to see if they behave in 

 the same way. Rut it is most important that pure cultures of the 

 various types should be made by breeding for several generations. 

 For this purpose the tall varieties should be chosen preferably, since 

 they promise a much better harvest than the half-dwarf ones which 

 I employed in my experiment. 



