The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. i8. Delphinium Consolida stria-tum plenum. Diagram of a branchof which the left half was blue,and of which the right bore flowerswith fine blue stripes on a pale redbackground. 1899. Fig. 19. A sectorial flowerof the same variety. Thewhole right half was darkblue; the left, pale redwith scattered blue stripes. tered blue stripes, and Nos. 3 and 8 half blue and halfstriped. I obtained this branch in my culture of 1899;similar cases are not at all rare. Branches with nothingl)ut blue flower
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. i8. Delphinium Consolida stria-tum plenum. Diagram of a branchof which the left half was blue,and of which the right bore flowerswith fine blue stripes on a pale redbackground. 1899. Fig. 19. A sectorial flowerof the same variety. Thewhole right half was darkblue; the left, pale redwith scattered blue stripes. tered blue stripes, and Nos. 3 and 8 half blue and halfstriped. I obtained this branch in my culture of 1899;similar cases are not at all rare. Branches with nothingl)ut blue flowers also occur, but the seeds obtained fromthe 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 minute purple spotting characteristic of some green-skinnedvarieties sometimes takes the form of a deep uniform purple. Theseuniformly purple seeds produce the ordinary form with small purplespots and no more full purples than are usually produced. (Trans-lators Note.) The
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