The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. 122. Valeriana officinalis. xA-ii entire plant the stem ofwhich attained the height of lO centimeters only. Photo-graphed from life in June 1900. Disposition of the leavesspiral below, unilateral above. In consequence of this rarity the belief prevailed,up till about 10 years ago, that these torsions were notheritable. The general view was that they were inducedby special external influences which operated immediatelyupon the individual every time the anomaly arose. At thattime the experi
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. 122. Valeriana officinalis. xA-ii entire plant the stem ofwhich attained the height of lO centimeters only. Photo-graphed from life in June 1900. Disposition of the leavesspiral below, unilateral above. In consequence of this rarity the belief prevailed,up till about 10 years ago, that these torsions were notheritable. The general view was that they were inducedby special external influences which operated immediatelyupon the individual every time the anomaly arose. At thattime the experiments which I had made with a twisted The Spiral Disposition of the Leaves. 529. .>
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