Read e-book online Contributions to the Theory of Natural Selection: A Series PDF
By Alfred Russel Wallace
Alfred Russel Wallace (1823-1913) is considered the co-discoverer with Darwin of the idea of evolution. It was once an essay which Wallace despatched in 1858 to Darwin (to whom he had committed his most renowned ebook, The Malay Archipelago) which impelled Darwin to submit a piece of writing on his personal long-pondered idea concurrently with that of Wallace. As a vacationing naturalist and collector within the a ways East and South the United States, Wallace already prone in the direction of the Lamarckian thought of transmutation of species, and his personal researches confident him of the truth of evolution. at the booklet of at the starting place of Species, Wallace turned one in all its so much well-liked advocates. This moment, corrected, variation (1871) of a chain of essays released in ebook shape in 1870, exhibits the advance of his considering evolution, and emphasises his admiration for, and help of, Darwin's paintings.
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Additional resources for Contributions to the Theory of Natural Selection: A Series of Essays
Granted therefore, a ic tendency " to reproduce the original type of the species, still the variety must ev^r re- INDEFINITELY FROM THE ORIGINAL TYPE. 37 main preponderant in numbers, and under adverse physical conditions again alone survive. But this new, improved, and populous race might itself, in course of time, give rise to new varieties, exhibiting several diverging modifications of form, any of which, tending to increase the facilities for preserving existence, must, by the same general law, in their turn become predominant.
11 near their bases will be often very different, representative species of some genera occurring, and even whole genera being peculiar to one side only, as is remarkably seen in the case of the Andes and Rocky Mountains. A similar phenomenon occurs when an island has been separated from a continent at a very early period. The shallow sea between the Peninsula of Malacca, Java, Sumatra and Borneo was probably a continent or large island at an early epoch, and may have become submerged as the volcanic ranges of Java and Sumatra were elevated.
This new group being subject to these altered conditions, has modifications of structure and organization given 16 ON THE LAW WHICH HAS EEGULATED to it, and becomes the representative group of the former one in another geological formation. It may, however, happen, that though later in time, the new series of species may never attain to so high a degree of organization as those preceding it, but in its turn become extinct, and give place to yet another modification from the same root, which may be of higher or lower organization, more or less numerous in species, and more or less varied in form and structure than either of those which preceded it.
Contributions to the Theory of Natural Selection: A Series of Essays by Alfred Russel Wallace