The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. 126. Eqiiisetum Tehnatcja. Spiral torsion of an erect stem. able nnmbers, in my tricotylons and syncotylons races(Fig. 96, p. 464). Unless direct experiments in isolation have been madeit is impossible in the majority of cases to be certain Rare Spiral Torsiojis. 539 wliether the race we are dealing with is a half or an inter-mediate race. Nevertheless the rarity of the anomalyin repeated sowings strongly indicates the former alter-native. This was certainly the case in Liipiiius Intciis,
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. 126. Eqiiisetum Tehnatcja. Spiral torsion of an erect stem. able nnmbers, in my tricotylons and syncotylons races(Fig. 96, p. 464). Unless direct experiments in isolation have been madeit is impossible in the majority of cases to be certain Rare Spiral Torsiojis. 539 wliether the race we are dealing with is a half or an inter-mediate race. Nevertheless the rarity of the anomalyin repeated sowings strongly indicates the former alter-native. This was certainly the case in Liipiiius Intciis,. Fig. 127. Casiiarina quadrivalvis. A branch with a hitcraltorsion, a. From the botanical garden in Anisterdani,1897. Silcne nodi flora and other species which occasionallyproduced spiral torsions in my cultures. In J^alcrianaofficinalis (Fig. 122, p. 528), which has already beenmentioned, the proportion of anomabms individuals raised 540 Heritable Spiral Torsions. from seeds gathered from twisted stems was very small,and in Rubia tinctorum, of which I have had severalbeautiful instances of spiral torsions from the fields inHolland, they are never by any means common, although
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