[34 and 35]

Fig. 36

Asparagus Nov. 29th

[Diagrams]

Fig. 36 (1/2 scale) no lettering Diagram IV

Fig. 36 Asparagus officinalis: older seedling, observed in same manner as in last case, from but only from 10° 15' a.m

8° 10' P.m, (Nov. 29th) with position of apex on following morning shown. Movement of apex magnified 9 times 4 1/2 times in figure given

[35v]

75

Ipomoea

the relative fertility of the two lots. The stems of the six crossed plants looked so much finer than those of the six self-fertilised plants, that after the pods capsules had been gathered and most of the leaves had fallen off, I weighed them. Those of the crossed plants weighed 2693 grains; whilst those of the self-fertilised plants weighed only 1173 grains; or as 100 to 44: but as the diseased and dwarfed crossed plants was is here included, the superiority of the formen in weight was is really greater. Navis

The effects on the offspring of crossing different flowers on the same plant of an Ipomoea, instead of of crossing distinct individuals (a) in comparison with self fertilisation.

In all the foregoing experiments, seedlings from flowers crossed by pollen from a distinct plant (though generally in the later generation more or less closely related) were put into competition with, and almost invariably proved markedly superior in height to the offspring of from self-fertilised flowers.

[Cross and self fertilisation, p. 41: "The six crossed plants (the diseased one here included) yielded spontaneously 101 capsules, and the six self-fertilised plants 88, the latter being chiefly produced by one of the plants. But as the diseased plant, which yielded hardly any seed, is here included, the ratio of 101 to 88 does not fairly give the relative fertility of the two lots. The stems of the six crossed plants looked so much finer than those of the six self-fertilised plants, that after the capsules had been gathered and most of the leaves had fallen off, they were weighed. Those of the crossed plants weighed 2,693 grains, whilst those of the self-fertilised plants weighed only 1,173 grains, or as 100 to 44; but as the diseased and dwarfed crossed plant is here included, the superiority of the former in weight was really greater.
The Effects on the Offspring of crossing different Flowers on the same Plant, instead of crossing distinct Individuals.—In all the foregoing experiments, seedlings from flowers crossed by pollen from a distinct plant (though in the later generations more or less closely related) were put into competition with, and almost invariably proved markedly superior in height to the offspring from self-fertilised flowers."]