On the Origin of Species By Means of Natural Selection, Or, the Preservation of Favoured Races in the Struggle for Life
On the Origin of Species By Means of Natural Selection, Or, the Preservation of Favoured Races in the Struggle for Life
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In our eReader you can find the full English version of the book. Read On the Origin of Species By Means of Natural Selection, Or, the Preservation of Favoured Races in the Struggle for Life 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 On the Origin of Species By Means of Natural Selection, Or, the Preservation of Favoured Races in the Struggle for Life
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To quickly assess the difficulty of the text, read a short excerpt:
Kolreuter, whose accuracy has been confirmed by every subsequentobserver, has proved the remarkable fact, that one variety of thecommon tobacco is more fertile, when crossed with a widely distinctspecies, than are the other varieties. He experimentised on fiveforms, which are commonly reputed to be varieties, and which he testedby the severest trial, namely, by reciprocal crosses, and he foundtheir mongrel offspring perfectly fertile. But one of these fivevarieties, when used either as father o...r mother, and crossed with theNicotiana glutinosa, always yielded hybrids not so sterile as thosewhich were produced from the four other varieties when crossed with N. Glutinosa. Hence the reproductive system of this one variety must havebeen in some manner and in some degree modified.
From these facts; from the great difficulty of ascertaining theinfertility of varieties in a state of nature, for a supposed varietyif infertile in any degree would generally be ranked as species; fromman selecting only external characters in the production of the mostdistinct domestic varieties, and from not wishing or being able toproduce recondite and functional differences in the reproductivesystem; from these several considerations and facts, I do not thinkthat the very general fertility of varieties can be proved to be ofuniversal occurrence, or to form a fundamental distinction betweenvarieties and species.
What to read after On the Origin of Species By Means of Natural Selection, Or, the Preservation of Favoured Races in the Struggle for Life?
You can find similar books in the "Read Also" column, or choose other free books by Darwin, Charles, 1809-1882 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Kolreuter, whose accuracy has been confirmed by every subsequentobserver, has proved the remarkable fact, that one variety of thecommon tobacco is more fertile, when crossed with a widely distinctspecies, than are the other varieties. He experimentised on fiveforms, which are commonly reputed to be varieties, and which he testedby the severest trial, namely, by reciprocal crosses, and he foundtheir mongrel offspring perfectly fertile. But one of these fivevarieties, when used either as father o...r mother, and crossed with theNicotiana glutinosa, always yielded hybrids not so sterile as thosewhich were produced from the four other varieties when crossed with N. Glutinosa. Hence the reproductive system of this one variety must havebeen in some manner and in some degree modified.
From these facts; from the great difficulty of ascertaining theinfertility of varieties in a state of nature, for a supposed varietyif infertile in any degree would generally be ranked as species; fromman selecting only external characters in the production of the mostdistinct domestic varieties, and from not wishing or being able toproduce recondite and functional differences in the reproductivesystem; from these several considerations and facts, I do not thinkthat the very general fertility of varieties can be proved to be ofuniversal occurrence, or to form a fundamental distinction betweenvarieties and species.
What to read after On the Origin of Species By Means of Natural Selection, Or, the Preservation of Favoured Races in the Struggle for Life?
You can find similar books in the "Read Also" column, or choose other free books by Darwin, Charles, 1809-1882 to read onlineMoreLess
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