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Darwin, Charles, 1809-1882

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


Column 3: From Self-fertilised Plant again self-fertilised, forming the
third Self-fertilised generation.
Pot 1 : 87 2/8 : 72 4/8.
Pot 1 : 49 : 14 2/8.
Pot 2 : 98 4/8 : 73.
Pot 2 : 0 : 110 4/8.
Pot 3 : 99 : 106 4/8.
Pot 3 : 15 2/8 : 73 6/8.
Pot 4 : 97 6/8 : 48 6/8.
Pot 5 : 48 6/8 : 81 2/8.
Pot 5 : 0 : 61 2/8.
Total : 495.50 : 641.75.
The seven crossed plants (for two of them died) here average 70.78
inches, and the nine self-fertilised plants 71.3 inches in height; or as
100 to barely 101. In four out of these five pots, a self-fertilised
plant flowered before any one of the crossed plants. So that,
differently from the last case, the self-fertilised plants are in some
respects slightly superior to the crossed.
If we now consider the crossed and self-fertilised plants of the three
generations, we find an extraordinary diversity in their relative
heights. In the first generation, the crossed plants were inferior to
the self-fertilised as 100 to 178; and the flowers on the original
parent-plants which were crossed with pollen from a distinct plant
yielded much fewer seeds than the self-fertilised flowers, in the
proportion of 100 to 150. But it is a strange fact that the
self-fertilised plants, which were subjected to very severe competition
with the crossed, had on two occasions no advantage over them.


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