The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . ants. In the case of double stocks one may reckon onbetween 50-60% double offspring according to the treat-ment and selection of the seed. Pot culture favors doub- 1 mg. 3 The transformation of stamens into petals often goes so far that no pollen isformed. When this oc-curs the stigma of thedouble flower must befertilized with the pol-len of a single floweror left to be pollinatedby insects. The resultis that the race givesrise to both forms everyyear. For instance Pa-paver nudicaule auran-tia
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . ants. In the case of double stocks one may reckon onbetween 50-60% double offspring according to the treat-ment and selection of the seed. Pot culture favors doub- 1 mg. 3 The transformation of stamens into petals often goes so far that no pollen isformed. When this oc-curs the stigma of thedouble flower must befertilized with the pol-len of a single floweror left to be pollinatedby insects. The resultis that the race givesrise to both forms everyyear. For instance Pa-paver nudicaule auran-tiacumplenum, the seedsof which give rise tobetween 40 and 60% ofdouble-flowered speci-mens every year. It isthe other way roundwith the double Petunia whose capsules are usually mal-formed ; but they develop a few stamens, with the pollenfrom which the stigmas of single flowers are dusted, ^Ibid. ^ Seed catalogue of D. Sachs, Quedlinburg, 1890-91. (DianfhusCaryophylliis c. ft. Margaritae, novelty 1889). ^ Chate, Culture pratique des Giroftees. Nobbe. Botaji. Central-blatt, Vol. XXXII, 1887, p. Fig. 37. Anemone coronaria, TheBride. Double on one side, singleon the other. From the cultures ofMessrs. E. H. Krelage & Son ofHaarlem. The Origin of Linaria Vulgaris Peloria. 201 preferably after castration. The seeds collected afterthis operation are said to give from 25 to 40% doubleplants the number varying directly with the care withwhich the castration was carried out. Double flowers are also subject to sectorial and bud-variation. A chestnut tree {Acsculus Hippocastaniun)at Geneva, a single branch of which has borne doubleflowers for many years, ^ is perhaps the best known ex-ample of the latter, whilst our Fig. ^7 gives an interest-ing case of the former. It is a flower of the pure whiteAncjjioiie coronaria, The Bride, which, like the Py-rcthruin, I owe to the kindness of Mr. Krelage. It grewin a bed of the single variety; the plant which bore ithad exclusively single flowers
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