The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . oup of 4 and one of5; c, split into three groups containing 5—7 and 5 singlefruits; d, one group has 16 and the other 5 divisions offruil and stigmas; c, fruit with ^2> divisions and stigmas(1895). race- is remarkable from the fact that tlie stems have,as is v^ell known, a sympodial structure (Fig. 119),Therefore the anomaly affects, as a rule, one member ofthe sympodium only; but sometimes it extends to twoor more adjacent ones. These are again succeeded bvatavistic members. Each part term
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . oup of 4 and one of5; c, split into three groups containing 5—7 and 5 singlefruits; d, one group has 16 and the other 5 divisions offruil and stigmas; c, fruit with ^2> divisions and stigmas(1895). race- is remarkable from the fact that tlie stems have,as is v^ell known, a sympodial structure (Fig. 119),Therefore the anomaly affects, as a rule, one member ofthe sympodium only; but sometimes it extends to twoor more adjacent ones. These are again succeeded bvatavistic members. Each part terminates n^ a flower. ^ Revue gcncralc dc hotaniqiic, 1899, Vol. XT, p. 143.^ Bntanisch Jaarh. Gent, 1894. p. 81: and 1897. p. 67. 524 TJie Inconstancy of Fasciatcd Races. In the fasciated parts these flowers are broadened andusually more or less divided, the fruit sometimes form-ing a flat structure (Fig. 120^), with or without one ortwo lateral fruits in the same flower (Fig. \20 c and d).Often these latter are pentamerous. Lastly the wholefruit can be split into two or three nearly equal parts. 10 II 15 20 23 Fig. 121. Geranium molle fasciatuin. Curve representingthe number of sections of the fruit in the individualflowers of the sixth generation, June 1895; a, number ofnormal flowers far above 100; number of flowers with 6to 23 stigmas, 120. (Fig 120 b). In these various types of splitting thereseems to be a tendency to the production of whorls of five,and the lateral flowers nearly always present this race began with a specimen found wild in 1888and m the third and fourth generations produced 25 to The Significance of the Atazisis. 525 30% individuals with fasciations. In llic two followinggenerations they were much more abundant. In the sixththere were 65% fasciated specimens, in a culture of 220plants, and these afforded me sufficient material for astatistical examination. For this purpose I collected,shortly before the ripening of the seed, all the aberrantflo
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