himself in his article in the Nineteenth Century for April, 1886.
He there wrote as follows, quoting from section 166 of his
"Principles of Biology," which appeared in 1864:-

"Where the life is comparatively simple, or where surrounding
circumstances render some one function supremely important, the
survival of the fittest" (which means here the survival of the
luckiest) "may readily bring about the appropriate structural
change, without any aid from the transmission of functionally-
acquired modifications" (into which effort and design have entered).
"But in proportion as the life grows complex--in proportion as a
healthy existence cannot be secured by a large endowment of some one
power, but demands many powers; in the same proportion do there
arise obstacles to the increase of any particular power, by 'the
preservation of favoured races in the struggle for life'" (that is
to say, through mere survival of the luckiest). "As fast as the
faculties are multiplied, so fast does it become possible for the
several members of a species to have various kinds of superiority
over one another. While one saves its life by higher speed, another
does the like by clearer vision, another by keener scent, another by
quicker hearing, another by greater strength, another by unusual
power of enduring cold or hunger, another by special sagacity,
another by special timidity, another by special courage; and others
by other bodily and mental attributes. Now it is unquestionably
true that, other things equal, each of these attributes, giving its
possessor an equal extra chance of life, is likely to be transmitted
to posterity. But there seems no reason to believe it will be
increased in subsequent generations by natural selection. That it
may be thus increased, the animals not possessing more than average
endowments of it must be more frequently killed off than individuals