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Darwin, Charles, 1809-1882

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


Pot 4 : 32 2/8 : 28 3/8.
Pot 4 : 29 3/8 : 26.
Pot 4 : 27 1/8 : 25 2/8.
Pot 5 : 28 1/8 : 29.
Pot 5 : 27 : 24 6/8.
Pot 5 : 25 3/8 : 23 2/8.
Pot 5 : 24 3/8 : 24.
Pot 6 : 33 5/8 : 44 2/8.
Pot 6 : 32 : 37 6/8.
Pot 6 : 26 1/8 : 37.
Pot 6 : 25 : 35.
Pot 7 : 30 6/8 : 27 2/8.
Pot 7 : 30 3/8 : 19 2/8.
Pot 7 : 29 2/8 : 21.
Pot 8 : 39 3/8 : 23 1/8.
Pot 8 : 37 2/8 : 23 4/8.
Pot 8 : 36 : 25 4/8.
Pot 8 : 36 : 25 1/8.
Pot 9 : 33 3/8 : 19 3/8.
Pot 9 : 25 : 16 3/8.
Pot 9 : 25 3/8 : 19.
Pot 9 : 21 7/8 : 18 6/8.
Total : 1014.00 : 921.63.
I determined on this occasion to avoid the error of using pollen of not
quite equal maturity for crossing and self-fertilisation; so that I
squeezed pollen out of the conjoined anthers of young flowers for both
operations. Several flowers on the crossed plant in Pot 1 in Table 5/70
were again crossed with pollen from a distinct plant. Several other
flowers on the self-fertilised plant in the same pot were again
self-fertilised with pollen from the anthers of other flowers on the
SAME PLANT. Therefore the degree of self-fertilisation was not quite so
close as in the last generation, in which pollen from the SAME FLOWER,
kept in paper, was used. These two lots of seeds were thinly sown on
opposite sides of nine pots; and the young seedlings were thinned, an
equal number of nearly as possible the same age being left on the two
sides.


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