Column 1: Name of plant and feature observed.
Column 2: Plants from a cross with a fresh stock.
Column 3: Intercrossed plants of the same stock.
Column 4: Self-fertilised plants.
Mimulus luteus--the intercrossed plants are derived from a cross between
two plants of the 8th self-fertilised generation. The self-fertilised
plants belong to the 9th generation: 100 : 4 : 3.
Eschscholtzia californica--the intercrossed and self-fertilised plants
belong to the 2nd generation: 100 : 45 : 40.
Dianthus caryophyllus--the intercrossed plants are derived from
self-fertilised of the 3rd generation, crossed by intercrossed plants of
the 3rd generation. The self-fertilised plants belong to the 4th
generation: 100 : 45 : 33.
Petunia violacea--the intercrossed and self-fertilised plants belong to
the 5th generation: 100 : 54 : 46.
NB.--In the above cases, excepting in that of Eschscholtzia, the plants
derived from a cross with a fresh stock belong on the mother-side to the
same stock with the intercrossed and self-fertilised plants, and to the
corresponding generation.
These cases show us how greatly superior in innate fertility the
seedlings from plants self-fertilised or intercrossed for several
generations and then crossed by a fresh stock are, in comparison with
the seedlings from plants of the old stock, either intercrossed or
self-fertilised for the same number of generations.
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