It should convey to us an idea
of the hereditary relations during the life-time of the variety.
It is manifest that the construction of such a genealogical tree
requires a number of separate experiments. These should be extended over
a series of years. Each should include a number of individuals large
enough to allow the determination of the proportion of the different
types among the offspring of a single plant. A species which is easily
fertilized by its own pollen, and which bears capsules with [315] large
quantities of seeds, obviously affords the best opportunities. As such,
I have chosen the common snapdragon of the gardens, _Antirrhinum majus_.
It has many striped varieties, some tall, others of middle height, or of
dwarfed stature. In some the ground-color of the flowers is yellow, in
others it is white, the yellow disappearing, with the exception of a
large mark in the throat. On these ground-colors the red pigment is seen
lying in streaks of pure carmine, with white intervals where the yellow
fails, but combined with yellow to make a fiery red, and with yellow
intervals when that color is present. This yellow color is quite
constant and does not vary in any marked degree, notwithstanding the
fact that it seems to make narrower and broader stripes, according to
the parts of the corolla left free by the red pigment.
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