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Darwin, Charles, 1809-1882

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

77 capsules.
Therefore 20 Self-fertilised plants would have produced 20.00 capsules.
The seeds contained in 8 capsules from the Chelsea-crossed plants
weighed 1.1 grains.
The seeds contained in 8 capsules from the Intercrossed plants weighed
0.51 grains.
The seeds contained in 8 capsules from the Self-fertilised plants
weighed 0.33 grains.
If we combine the number of capsules produced together with the average
weight of contained seeds, we get the following extraordinary ratios:
Weight of seed produced by the same number of Chelsea-crossed and
intercrossed plants as 100 to 4.
Weight of seed produced by the same number of Chelsea-crossed and
self-fertilised plants as 100 to 3.
Weight of seeds produced by the same number of intercrossed and
self-fertilised plants as 100 to 73.
It is also a remarkable fact that the Chelsea-crossed plants exceeded
the two other lots in hardiness, as greatly as they did in height,
luxuriance, and fertility. In the early autumn most of the pots were
bedded out in the open ground; and this always injures plants which have
been long kept in a warm greenhouse. All three lots consequently
suffered greatly, but the Chelsea-crossed plants much less than the
other two lots. On the 3rd of October the Chelsea-crossed plants began
to flower again, and continued to do so for some time; whilst not a
single flower was produced by the plants of the other two lots, the
stems of which were cut almost down to the ground and seemed half dead.


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