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D. APPLETON & CO.’S PUBLICATIONS.

H

ON

THE ORIGIN OF SPECIES

BY

Means of Natural Selection;

01:,

THE PRESERVATION OF FAVORED RACES

IN THE

STRUGGLE FOR LIFE.

BY

CHARLES DARWIN, A. M.

One Volume. l2mo. Cloth. $52.00.

“ His first point is to show that species are in many cases not well
defined, and that the whole order of natural history seems to be in a
state of mutation, by reason of constant variations. Thus even under
domestication, important changes may be introduced by intercrossing,
by selection of the best individuals for propagation, by crossing parents
marked by however slight, but favorable peculiarities.

“His second point is what he terms the universal and necessary
struggle for existence. This follows from the high geometrical ratio
of increase common to all beings. If there were no catastrOphes,
any one of the existing species would be sufficiently numerous in a

few thousand years to cover the whole earth, to the exclusion of every
thing else.

“His third point is to prove that this struggle is directed by the
law of natural selection. Even the races of domestic animals may be
constantly improved and modified by choosing the best individuals
for propagation. Nature brings the same discipline to bear upon the
whole domain of animal and vegetable life. She seizes at once upon
any slight variation that is favorable, and perpetuates it; in the uni-

versal pressure, any variation that is injurious is immediately extin-
guisbed."

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