p.10-11 There must be, it is said, a sufficient development of the instinct at the start to give
it 'selective value,' and so to secure its further fixing in the fully evolved function.
p.89 The theory of natural selection is to be accepted not merely as a law of biology as
such, but as a principle of the natural world, which finds appropriate application in all the sciences of life and
mind.
p.111 Darwin's estimate of his own powers... 'Therefore my success as a man of science, whatever this may
have amounted to, has been determined, as far as I can judge, by complex and diversified mental qualities and conditions.
Of these the most important have been - the love of science - unbounded patience in long reflecting over any subject - industry
in observing and collecting facts - and a fair share of invention as well as of common sense. With such moderate abilities
as I possess, it is truly surprising that I should have influenced to a considerable extent the belief of scientific men on
some important points.'
