Darwiniana; Essays And Reviews Pertaining To Darwinism by Asa GrayDarwiniana; Essays And Reviews Pertaining To Darwinism by Asa Gray

Darwiniana; Essays And Reviews Pertaining To Darwinism

byAsa Gray

Paperback | August 10, 2012

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Excerpt: ...from his idea of species, and even conceives a species to have been as numerous in individuals and as wide-spread over space, or as segregated in discontinuous spaces, from the first as at the later period. The station which it inhabits, therefore, is with other naturalists in no wise essential to the species, and may not have been the region of its origin. In Agassiz's view the habitat is supposed to mark the origin, and to be a part of the character of the species. The habitat is not merely the place where it is, but a part of what it is. Most naturalists recognize varieties of species; and many, like De Candolle, have come to conclude that varieties of the highest grade, or races, so far partake of the characteristics of species, and are so far governed by the same laws, that it is often very difficult to draw a clear and certain distinction between the two. Agassiz will not allow that varieties or races exist in Nature, apart from man's agency. Most naturalists believe that the origin of species is supernatural, their dispersion or particular geographical area, natural, and their extinction, when they disappear, also the result of physical causes. In the view of Agassiz, if rightly understood, all three are equally independent of physical cause and effect, are equally supernatural. In comparing preceding periods with the present and with each other, most naturalists and palaeontologists now appear to recognize a certain number of species as having survived from one epoch to the next, or even through more than one formation, especially from the Tertiary into the post-Tertiary period, and from that to the present age. Agassiz is understood to believe in total extinctions and total new creations at each successive epoch, and even to recognize no existing species as ever contemporary with extinct ones, except in the case of recent exterminations. These peculiar views if sustained will effectually dispose of every form of derivative hypothesis....
Title:Darwiniana; Essays And Reviews Pertaining To DarwinismFormat:PaperbackDimensions:106 pages, 9.69 × 7.44 × 0.22 inPublished:August 10, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:1153598752

ISBN - 13:9781153598750

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