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Darwin, Charles, 1809-1882

"Effects of Cross and Self Fertilisation in the Vegetable Kingdom"

. : .. : .. : 5.
Primula veris--offspring from long-styled plants of the third
illegitimate generation, crossed by a fresh stock, compared with plants
of the fourth illegitimate and self-fertilised generation, in fertility
in following year:
.. : .. : .. : .. : 3.5.
Primula veris--(equal-styled, red-flowered variety)--offspring from
plants self-fertilised for two generations and then crossed by a
different variety, compared with plants of the third self-fertilised
generation:
3 : 8.66 : 3 : 7.33 : 85.
Primula veris--(equal-styled, red-flowered variety)--offspring from
plants self-fertilised for two generations and then crossed by a
different variety, compared with plants of the third self-fertilised
generation, in fertility:
.. : .. : .. : .. : 11.
In these three tables the measurements of fifty-seven species, belonging
to fifty-two genera and to thirty great natural families, are given. The
species are natives of various parts of the world. The number of crossed
plants, including those derived from a cross between plants of the same
stock and of two different stocks, amounts to 1,101; and the number of
self-fertilised plants (including a few in Table 7/C derived from a
cross between plants of the same old stock) is 1,076. Their growth was
observed from the germination of the seeds to maturity; and most of them
were measured twice and some thrice.


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