They were, however, sometimes grown in
separate rows in the open ground. With several of the species, the
crossed plants were again crossed, and the self-fertilised plants again
self-fertilised, and thus successive generations were raised and
measured, as may be seen in Table 7/A. Owing to this manner of
proceeding, the crossed plants became in the later generations more or
less closely inter-related.
In Table 7/B the relative weights of the crossed and self-fertilised
plants, after they had flowered and had been cut down, are given in the
few cases in which they were ascertained. The results are, I think, more
striking and of greater value as evidence of constitutional vigour than
those deduced from the relative heights of the plants.
The most important table is Table 7/C, as it includes the relative
heights, weights, and fertility of plants raised from parents crossed by
a fresh stock (that is, by non-related plants grown under different
conditions), or by a distinct sub-variety, in comparison with
self-fertilised plants, or in a few cases with plants of the same old
stock intercrossed during several generations. The relative fertility of
the plants in this and the other tables will be more fully considered in
a future chapter.
TABLE 7/A. Relative heights of plants from parents crossed with pollen
from other plants of the same stock, and self-fertilised.
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