Effects of Cross and Self Fertilisation in the Vegetable Kingdom eBook

This eBook from the Gutenberg Project consists of approximately 516 pages of information about Effects of Cross and Self Fertilisation in the Vegetable Kingdom.

Effects of Cross and Self Fertilisation in the Vegetable Kingdom eBook

This eBook from the Gutenberg Project consists of approximately 516 pages of information about Effects of Cross and Self Fertilisation in the Vegetable Kingdom.

Several flowers were crossed and self-fertilised in the usual manner, but there was no marked difference in the number of seeds which they yielded.  A vast number of spontaneously self-fertilised capsules were also produced under the net.  Seedlings were raised in five pots from the above seeds, and when the crossed were about 3 inches in height they showed a slight advantage over the self-fertilised.  When double this height, the sixteen crossed and sixteen self-fertilised plants were measured to the tips of their leaves; the former averaged 7.3 inches, and the self-fertilised 6.07 inches in height, or as 100 to 83.  In all the pots, excepting 4, a crossed plant flowered before any one of the self-fertilised plants.  The plants, when fully grown, were again measured to the summits of their ripe capsules, with the result in Table 5/51.

Table 5/51.  Limnanthes douglasii.

Heights of plants to the summits of their ripe capsules, measured in inches.

Column 1:  Number (Name) of Pot.

Column 2:  Crossed Plants.

Column 3:  Self-fertilised Plants.

Pot 1 :  17 7/8 :  15 1/8. 
Pot 1 :  17 6/8 :  16 4/8. 
Pot 1 :  13 :  11.

Pot 2 :  20 :  14 4/8. 
Pot 2 :  22 :  15 6/8. 
Pot 2 :  21 :  16 1/8. 
Pot 2 :  18 4/8 :  17.

Pot 3 :  15 6/8 :  11 4/8. 
Pot 3 :  17 2/8 :  10 4/8. 
Pot 3 :  14 :  0.

Pot 4 :  20 4/8 :  13 4/8. 
Pot 4 :  14 :  13. 
Pot 4 :  18 :  12 2/8.

Pot 5 :  17 :  14 2/8. 
Pot 5 :  18 5/8 :  14 1/8. 
Pot 5 :  14 2/8 :  12 5/8.

Total :  279.50 :  207.75.

The sixteen crossed plants now averaged 17.46, and the fifteen (for one had died) self-fertilised plants 13.85 inches in height, or as 100 to 79.  Mr. Galton considers that a higher ratio would be fairer, namely, 100 to 76.  He made a graphical representation of the above measurements, and adds the words “very good” to the curvature thus formed.  Both lots of plants produced an abundance of seed-capsules, and, as far as could be judged by the eye, there was no difference in their fertility.]

14.  Leguminosae.

In this family I experimented on the following six genera, Lupinus,
Phaseolus, Lathyrus, Pisum, Sarothamnus, and Ononis.

[Lupinus luteus. (5/2.  The structure of the flowers of this plant, and their manner of fertilisation, have been described by H. Muller ‘Befruchtung’ etc. page 243.  The flowers do not secrete free nectar, and bees generally visit them for their pollen.  Mr. Farrer, however, remarks ‘Nature’ 1872 page 499, that “there is a cavity at the back and base of the vexillum, in which I have not been able to find nectar.  But the bees, which constantly visit these flowers, certainly go to this cavity for what they want, and not to the staminal tube.”)

Copyrights
Project Gutenberg
Effects of Cross and Self Fertilisation in the Vegetable Kingdom from Project Gutenberg. Public domain.