The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. I-14. Ulmus campestris varie-gatiis. The variegated regionsare developed in widely differ-ent extents on the differentleaves. Fig. 145. Beta vulgaris saccha-rifcra. A chance \ariegatedleaf. The yellow and greentissues are superimposed uponone another in such a waythat the limits of the indi-vidual layers do not corre-spond. investigations of Bonnier and Flot. See G. Bonnier, Formationdes elements du cilindre central, Comptes rendus, Vol. CXXXT, (Nov. 12, 1900), and Sur la differenci
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. I-14. Ulmus campestris varie-gatiis. The variegated regionsare developed in widely differ-ent extents on the differentleaves. Fig. 145. Beta vulgaris saccha-rifcra. A chance \ariegatedleaf. The yellow and greentissues are superimposed uponone another in such a waythat the limits of the indi-vidual layers do not corre-spond. investigations of Bonnier and Flot. See G. Bonnier, Formationdes elements du cilindre central, Comptes rendus, Vol. CXXXT, (Nov. 12, 1900), and Sur la differenciation des tissus vascii-hires, loc. cit., p. 1276 (Dec. 1900) ; and Leon Flot, Sur Ioriginecommune des tissus dans la feuille et dans la lige, loc. cit. (Dec. 1900). DarKijis Pa)igenesis. 63: worker bees and similar cases. If wc let it droi, thefirst thesis stands out in a much purer light.
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