Evolution of the Colors of North American Land Birds
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In our eReader you can find the full English version of the book. Read Evolution of the Colors of North American Land Birds Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Evolution of the Colors of North American Land Birds
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He freely grants that Mr. Wallace has proved that some specific characters are useful, but insists that this is not sufficient to prove that all points of specific difference are so. The theory of * xxi, pp. 59-80.
EVOLUTION OF THE COLORS OF BLRDS. 119 natural selection is based upon the assumption that cer- tain characters are useful, but we are not justified in arguing from this that all characters have been devel- oped by natural selection and are therefore useful. Darwin himself freely conc...eded the inutility of many characters, and, as Mr. Romanes says, " there is positive evidence to show that the slight changes of form and colour which chiefly serve to distinguish allied species are often due to what Mr. Darwin calls 'the direct action of external conditions, ' such as changes of food, climate, etc. , as well as to mere independent variation on isolated areas, and in some of our domesticated pro- ductions, etc. ; and in none of these cases do the specific changes which result present a meaning of any kind.
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You can find similar books in the "Read Also" column, or choose other free books by Charles Augustus Keeler to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
He freely grants that Mr. Wallace has proved that some specific characters are useful, but insists that this is not sufficient to prove that all points of specific difference are so. The theory of * xxi, pp. 59-80.
EVOLUTION OF THE COLORS OF BLRDS. 119 natural selection is based upon the assumption that cer- tain characters are useful, but we are not justified in arguing from this that all characters have been devel- oped by natural selection and are therefore useful. Darwin himself freely conc...eded the inutility of many characters, and, as Mr. Romanes says, " there is positive evidence to show that the slight changes of form and colour which chiefly serve to distinguish allied species are often due to what Mr. Darwin calls 'the direct action of external conditions, ' such as changes of food, climate, etc. , as well as to mere independent variation on isolated areas, and in some of our domesticated pro- ductions, etc. ; and in none of these cases do the specific changes which result present a meaning of any kind.
What to read after Evolution of the Colors of North American Land Birds?
You can find similar books in the "Read Also" column, or choose other free books by Charles Augustus Keeler to read onlineMoreLess
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