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Onion Oct 31

(like yesterday) Movement yesterday rising for Heliotropism?? Main Bran

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[21v]

61

Chap VII

skull of the dolicocephalic type

Lastly the little understood principle of correlation may occasionally have played a part; as between great muscular development of the body & strongly projecting supra-orbital ridges. It is not improbable that the texture of the skin hair, which differs much in the different races, may stand in some kind of correlation with the structure of the skin; for the colour of the hair & of the skin are often correlated, & with the mandans *51A, the colour of the hair & its texture are likewise correlated as is likewise so it is with the colour of the skin & the odour emitted by it.

It is also with the breeds of sheep, it is asserted that with sheep the number of the hairs on within a given space stand in some connection with the number of the excretory pores *(52) 54. Other such many correlated modifications have probably exist [words excised] occurred with man,

[Descent 1: 247-8: "It is also possible that increased bodily stature, with no corresponding increase in the size of the brain, may have given to some races (judging from the previously adduced cases of the rabbits) an elongated skull of the dolichocephalic type.
Lastly, the little-understood principle of correlation will almost certainly have come into action, as in the case of great muscular development and strongly projecting supra-orbital ridges. It is not improbable that the texture of the hair, which differs much in the different races, may stand in some kind of correlation with the structure of the skin; for the colour of the hair and skin are certainly correlated, as is its colour and texture with the Mandans.53 The colour of the skin and the odour emitted by it are likewise in some manner connected. With the breeds of sheep the number of hairs within a given space and the number of the excretory pores stand in some relation to each other.54 If we may judge from the analogy of our domesticated animals, many modifications of structure in man probably come under this principle of correlated growth.
53 Mr. Catlin states ('N. American Indians,' 3rd edit. 1842, vol. i. p. 49) that in the whole tribe of the Mandans, about one in ten or twelve of the members of all ages and both sexes have bright silvery grey hair, which is hereditary. Now this hair is as coarse and harsh as that of a horse's mane, whilst the hair of other colours is fine and soft.
54 On the odour of the skin, Godron, 'Sur l'Espèce,' tom. ii. p. 217. On the pores in the skin, Dr. Wilckens, 'Die Aufgaben der landwirth. Zootechnik,' 1869, s. 7."]