[55]

Circumnutation of cot. of cabbage— (stem not secured) facing Light. traced on vertical glass from 10° 50' a.m Oct 7th to 8° a.m. Oct 8th

Fig 7.

[55v]

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Chapter 0 9

found by Professor H. Hoffmann to be quite self-sterile excepting on one occasion *(*Zur Speciesfrage 1875 p 47): P somniferum was with me always completely self-fertile.) (Eschscholtzia californica. This species deserves a fuller consideration. A plant cultivated by Fritz Müller in S Brazil happened to flowered a month before any of the others, and it did not produce a single capsule. This led him to make further observations during the next six generations, and he found that all his plants now completely sterile unless they were crossed by insects or were artificially fertilised with pollen from a distinct plant, in which case they were partly completely fertile *(*Bot. Zeitung 1868 p. 115 and 1869 p 223) I was much surprised at this fact, as I had found that English plants, when covered by a net, set a considerable number of capsules; and that these contained seeds by weight, compared with those our  on plants intercrossed by the bees, as 71 to 100 * Professor Hidehand ebrand, however, found this species much more fertile self-sterile in Germany than it was with one in England, for the capsules produced by self-fertilised flowers, compared with those from intercrossed flowers contained seeds in the ratio of only 11 to 100.─ (head on)

[Cross and self fertilisation, pp. 331-2: "So it was with Papaver vagum: another species, P. alpinum, was found by Professor H. Hoffmann to be quite self-sterile excepting on one occasion; whilst P. somniferum has been with me always completely self-sterile.
Eschscholtzia californica.—This species deserves a fuller consideration. A plant cultivated by Fritz Müller in South Brazil happened to flower a month before any of the others, and it did not produce a single capsule. This led him to make further observations during the next six generations, and he found that all his plants were completely sterile, unless they were crossed by insects or were artificially fertilised with pollen from a distinct plant, in which case they were completely fertile.* I was much surprised at this fact, as I had found that English plants, when covered by a net, set a considerable number of capsules; and that these contained seeds by weight, compared with those on plants intercrossed by the bees, as 71 to 100. Professor Hildebrand, however, found this species much more self-sterile in Germany than it was with me in England, for the capsules produced by self-fertilised flowers, compared with those from intercrossed flowers, contained seeds in the ratio of only 11 to 100.
'Zur Speciesfrage' 1875 page 47."]