[294]

Oct 30'

Fern — young leaf Dark

Horizontal glass

[sketch]

[data not transcribed]

(Used)

Magnification

size of leaf

[294v]

[text excised] at one age & some at all ages.

to one or both sexes and to the young or, the old. Not only are the laws of inheritance extremely complex, but so are the laws and caused which induce and govern variability. Sole Sexual relation, moreover, by which variations favouring certain individuals of the same sex are preserved The variations thus caused are preserved & accumulated by sexual selection, which is in itself an extremely complex affair, depending as it generally does, on the ardour in love, on the powers of perception, taste, will courage and rivalry of the male competitors, & on the powers of perception, taste & will of the female of either sex. Sexual selection will also be dominated by natural selection — for the general 145 (welfare of the species. Hence the manner in which the individuals of either sex or of both sexes become are modified

[Descent 1: 296: "Hence the successive steps in the modification of a species might readily be transmitted in different ways; some of the steps being transmitted to one sex, and some to both; some to the offspring at one age, and some at all ages. Not only are the laws of inheritance extremely complex, but so are the causes which induce and govern variability. The variations thus caused are preserved and accumulated by sexual selection, which is in itself an extremely complex affair, depending, as it does, on ardour in love, courage, and the rivalry of the males, and on the powers of perception, taste, and will of the female. Sexual selection will also be dominated by natural selection for the general welfare of the species. Hence the manner in which the individuals of either sex or of both sexes are affected through sexual selection cannot fail to be complex in the highest degree."]