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ORIGIN OF SPECIES
BY MEANS OF NATURAL SELECTION
OR THE PRESERVATION OF FAVORED RACES IN
THE STRUGGLE FOR LIFE
CHARLES DARWIN, M. A., LL. D., F. R. S.
WITH ADDITIONS AND CORRECTIONS
IN TWO VOLUMES
VARIATION UNDER NATURE.
Variability - Individual differences — Doubtful species Wide
ranging, much diffused, and common species, vary most,
Species of the larger genera in each country vary more fre-
quently than the species of the smaller genera-Many of the
species of the larger genera resemble varieties in being very
closely, but unequally, related to each other, and in having
tinction, on the descendants from a common parent-Explains
LAWS OF VARIATION.
Effects of changed conditions—Use and disuse, combined with
natural selection; organs of flight and of vision-Acclimatisa-