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action actual adaptation American animals appears argument become believe bring called cause close Cloth comes common conclusion connection consider continued course Darwin derivation direct distinct doctrine doubt equally evidence evolution existence expected explain facts favor final follow force former forms genera ground hand human hypothesis idea illustration increase individuals inference insects instance kind known laws least leaves less light living material matter means mind natural selection naturalists object observation operation organic origin particular perhaps period physical plants present principle probably produced prove question races reason referred regard relations remarks reviewer scientific seems sense side similar sort species structure succession suggest suppose tertiary theory things thought tion trees types universe variation varieties vary vegetable whole
Página 131 - And God said, Let the earth bring forth the living creature after his kind, cattle, and creeping thing, and beast of the earth after his kind: and it was so.
Página 38 - There is no exception to the rule that every organic being naturally increases at so high a rate, that if not destroyed, the earth would soon be covered by the progeny of a single pair.
Página 38 - We behold the face of nature bright with gladness, we often see superabundance of food ; we do not see, or we forget, that the birds which are idly singing round us mostly live on insects or seeds, and are thus constantly destroying life ; or we forget how largely these songsters, or their eggs, or their nestlings, are destroyed by birds and beasts of prey...
Página 276 - My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
Página 396 - XVIII. The Nature of Light: With a General Account of Physical Optics.
Página 18 - The green and budding twigs may represent existing species; and those produced during each former year may represent the long succession of extinct species. At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have tried to overmaster other species in the great battle for life.
Página 395 - II. Physics and Politics ; or, Thoughts on the Application of the Principles of "Natural Selection " and " Inheritance
Página 104 - I can entertain no doubt, after the most deliberate study and dispassionate judgment of which I am capable, that the view which most naturalists until recently entertained, and which I formerly entertained, namely, that each species has been independently created, is erroneous. I am fully convinced that species are not immutable...
Página 104 - ... been stated that I attribute the modification of species exclusively to natural selection, I may be permitted to remark that in the first edition of this work, and subsequently, I placed in a most conspicuous position — namely, at the close of the Introduction the following words : "I am convinced that natural selection has been the main but not the exclusive means of modification.