and VII. were condensed in one lecture. Chapter X. is
new, and I have not hesitated to add a few paragraphs wherever the
argument seemed especially to demand further evidence or
illustration.
One of my friends, reading the title of these lectures, said: "Of
man's origin you know nothing, of his future you know less." I fear
that many share his opinion, although they might not express it so
emphatically.
It would seem, therefore, to be in order to show that science is now
competent to deal with this question; not that she can give a final
and conclusive answer, but that we can reach results which are
probably in the main correct. We may grant very cheerfully that we
can attain no demonstration; the most that we can claim for our
results will be a high degree of probability. If our conclusions are
very probably correct, we shall do well to act according to them;
for all our actions in life are suited to meet the emergencies of a
probable but uncertain course of events.
We take for granted the probable truth of the theory of evolution as
stated by Mr. Darwin, and that it applies to man as really as to any
lower animal. At the same time it concerns our argument but little
whether natural selection is "omnipotent" or of only secondary
importance in evolution, as long as it is a real factor, or which
theory of heredity or variation is the more probable.
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