Smithsonian Miscellaneous Collections Vol 5 Classic Reprint

Author : Smithsonian Institution
Publisher : Forgotten Books
ISBN 13 : 9780267875221
Total Pages : 744 pages
Book Rating : 4.8/5 (752 download)

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Download or read book Smithsonian Miscellaneous Collections, Vol. 65 (Classic Reprint) written by Smithsonian Institution and published by Forgotten Books. This book was released on 2018-02-05 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Smithsonian Miscellaneous Collections, Vol. 65 Now in most large genera we find among the component species one which in its characters Occupies the mean between the extremes shown by the other forms, and which typically covers the entire economic, physical, and geographical range of the genus, unless the species on the borders of the generic range are isolated by barriers. Obviously this is the species best adapted to the conditions Of the present day and, if conditions Should remain indefinitely as_ they are now, such a species would gradually succeed, by the mere force of numbers and greater procreative power, which have already enabled it to overrun all the other forms, 1n exterminating all of the other species of the genus which it was able to reach. As families and orders are constructively the same as genera, we typically find in them a highly dominant genus, subfamily, or family, which stands in the same relation to them that the dominant species does to the genus. And among the higher groups the same thing is repeated; thus, for example, we find among the mammals the rodents, among the birds the finches, among the fishes the perches, among the flies the muscoid types, etc., each group including species almost all of which are of small average Size, yet never excessively small, representing the dominant types which, appear to be on the road to Supplanting all the other types through a development from their immediate stock of virile competing forms, and which, were conditions to remain in definitely as they are at the present epoch, would eventually come to form the entire world fauna. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.