[187]

Jun 15th Ipomoea nil tip 6 inches from glass

[data not transcribed]

(Abstracted)

[187v]

few flowers are born conspicuous and odoriferous. Of all colours white is the prevailing one; and of white flowers a considerably larger proportion namely 14.6 per cent smell sweetly than of any other colour; of the next most favourable colour, red, only 8.2 per cent are odoriferous.* The larger proportion sweet-smelling flowers amongst those of white flowers colour may depend in part on flowers which are fertilised by moths requiring the double aid of conspicuousness in the dusk and of odour. So close is the adaptation, or so great is the economy of nature, that flowers which are

[Cross and self fertilisation, p. 374: "Not a few flowers are both conspicuous and odoriferous. Of all colours, white is the prevailing one; and of white flowers a considerably larger proportion smell sweetly than of any other colour, namely, 14.6 per cent; of red, only 8.2 per cent are odoriferous.† The fact of a larger proportion of white flowers smelling sweetly may depend in part on those which are fertilised by moths requiring the double aid of conspicuousness in the dusk and of odour. So great is the economy of nature, that most flowers which are fertilised by crepuscular or nocturnal insects emit their odour chiefly or exclusively in the evening."]

[188]

Cotton Ipomoea nil Jun 20th

[data not transcribed]

[188v]

50 661

Chap. E 10

On the relation between the structure and conspicuousness of flowers, the visits of insects, and the advantages from cross-fertilisation.

It has already been shown that there is no close

[Cross and self fertilisation, p. 381: "On the Relation between the Structure and Conspicuousness of Flowers, the Visits of Insects, and the Advantages of Cross-fertilisation.
It has already been shown that there is no close relation between the number of seeds produced by flowers when crossed and self-fertilised, and the degree to which their offspring are aaffected by the two processes."]

[189]

Ipomoea continued (21st)

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[189v]

*page 54

In answer to a question by me, the editor of an entomological journal writes,─ "The Depressariæ, as is notorious to every collection of Noctuæ, come very freely to sugar, and

[Cross and self fertilisation, p. 383, n†: "† In answer to a question by me, the editor of an entomological journal writes—"The Depressariae, as is notorious to every collector of Noctuae, come very freely to sugar, and no doubt naturally visit flowers:" the 'Entomologists' Weekly Intelligencer' 1860 page 103."]