114 



Atavism. 



a way that those on one side of a spike are uniform and 

 those on tlie other striped.^ Flowers which are inserted 

 at the l)onn(laries of the two regions exhihit on one side 

 the color of one sector and on the other half, the stripes 

 of the other. A diagram of such a branch is shown in 

 Fie. 1^ in which the flowers Nos. 1. 4, 6, 9, and 11 are 

 dark blue, Xos. 2, 5, 7, 10, 12, and 13 pale red with scat- 



Fig. i8. Delphinium Consolida stria- 

 tum plenum. Diagram of a branch 

 of which the left half was blue, 

 and of which the right bore flowers 

 with fine blue stripes on a pale red 

 background. 1899. 



Fig. 19. A sectorial flower 

 of the same variety. The 

 whole right half was dark 

 blue; the left, pale red 

 with scattered blue stripes. 



tered blue stripes, and Nos. 3 and 8 half blue and half 

 striped. I obtained this branch in my culture of 1899; 

 similar cases are not at all rare. Branches with nothing 

 l)ut blue flowers also occur, but the seeds obtained from 

 the self-fertilization of such flowers gave rise in my gar- 

 den to the striped variety and not to a pure blue progeny. 



^ Exactly the same phenomenon is seen in the seedcoats of Pisum. 

 The minute purple spotting characteristic of some green-skinned 

 varieties sometimes takes the form of a deep uniform purple. These 

 uniformly purple seeds produce the ordinary form with small purple 

 spots and no more full purples than are usually produced. (Trans- 

 lator's Note.") 



