[95]

Nov. 9 Canna too cold— Dark Horizontal glass

Filament Beneath tied to tips of leaf.

[data not transcribed]

(Used)

[95v]

Chap VII

of each species & race is constantly hindered prevented by various checks; so that if any new check or cause of destruction, even a slight one, be super added, the race will surely decrease in number; & as savages rarely change their habits, decreasing numbers will sooner or later lead to extinction. The end in most cases being promptly determined by the inroads of other conquering & increasing tribes.

On the formation of the races of man.

At may be presumed mise that when we find the same race, though broken up into distinct tribes, ranging over a great area, as that of over America, we naturally attribute their general resemblance to descent from a common stock. In some cases the crossing of races already rendered distinct has been a potent cause of change. The singular fact that Europeans & Hindoos, who belong to the

[Descent 1: 240: "The difficulty, though great to our imagination, and really great if we wish to ascertain the precise causes, ought not to be so to our reason, as long as we keep steadily in mind that the increase of each species and each race is constantly hindered by various checks; so that if any new check, or cause of destruction, even a slight one, be superadded, the race will surely decrease in number; and as it has everywhere been observed that savages are much opposed to any change of habits, by which means injurious checks could be counterbalanced, decreasing numbers will sooner or later lead to extinction; the end, in most cases, being promptly determined by the inroads of increasing and conquering tribes.
On the Formation of the Races of Man.—It may be premised that when we find the same race, though broken up into distinct tribes, ranging over a great area, as over America, we may attribute their general resemblance to descent from a common stock. In some cases the crossing of races already distinct has led to the formation of new races. The singular fact that Europeans and Hindoos, who belong to the same Aryan stock and speak a language fundamentally the same, differ widely in appearance, whilst Europeans differ but little from Jews, who belong to the Semitic stock and speak quite another language, has been accounted for by Broca36 through the Aryan branches having been largely crossed during their wide diffusion by various indigenous tribes.
36 "On Anthropology," translation, 'Anthropolog. Review,' Jan. 1868, p. 38."]