From time to time the idea has suggested itself to some of the best
authorities on the amelioration of plants, that this atavism was
not due to an innate tendency, but, in many cases at least, was
produced by crosses between neighboring varieties. It is especially
owing to Verlot that this side of the question was brought forward.
But breeders as a rule have not attached much importance to this
supposition, chiefly because of the great practical difficulties
attending any attempt to guard the species of the larger cultures
against intermixture with other varieties. Bees and humble-bees fly
from bud to bud, and carry the pollen from one sort to another, and
separation by great distances would be required to avoid this
source of impurity.
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