The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom

by Charles Darwin

Nicotiana tabacum—offspring of plants self-fertilised for three
generations and then crossed by a slightly different variety, compared
with plants of the fourth self-fertilised generation, grown not much
crowded in pots, in height:
26 : 63.29 : 26 : 41.67 : 66.

Nicotiana tabacum—offspring of plants self-fertilised for three
generations and then crossed by a slightly different variety, compared
with plants of the fourth self-fertilised generation, grown much crowded
in pots, in height:
12 : 31.53 : 12 : 17.21 : 54.

Nicotiana tabacum—offspring of plants self-fertilised for three
generations and then crossed by a slightly different variety, compared
with plants of the fourth self-fertilised generation, grown much crowded
in pots, in weight:
.. : .. : .. : .. : 37.

Nicotiana tabacum—offspring of plants self-fertilised for three
generations and then crossed by a slightly different variety, compared
with plants of the fourth self-fertilised generation, grown in open
ground, in height:
20 : 48.74 : 20 : 35.20 : 72.

Nicotiana tabacum—offspring of plants self-fertilised for three
generations and then crossed by a slightly different variety, compared
with plants of the fourth self-fertilised generation, grown in open
ground, in weight:
.. : .. : .. : .. : 63.

Anagallis collina—offspring from a red variety crossed by a blue
variety, compared with the self-fertilised offspring of the red variety:
3 : 27.62 : 3 : 18.21 : 66.

Anagallis collina—offspring from a red variety crossed by a blue
variety, compared with the self-fertilised offspring of the red variety,
in fertility:
.. : .. : .. : .. : 6.

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:
8 : 7.03 : 8 : 3.21 : 46.

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:
.. : .. : .. : .. : 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.