Read Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint)

Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint)

George W. Peckham

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Description:Excerpt from Observations on Sexual Selection in Spiders of the Family Attidae, And, Protective Resemblance in Spiders Mr. Wallace, in his well known essay on Colors of Animals, remarks that color per 36 may be considered, normal and needs no special. Accounting for; that amid the constant variations of animals and plants color is ever tending to vary and to appear where it is absent; and that natural selection is con stantly eliminating such tints as are injurious to the species while it preserves and intensifies such as are useful; and in opposition to Darwin he has argued that the sexual diversity of color, common in many animals, has its primary cause in the special need of protection for the female, which represses in her the bright colors that are normally produced in both sexes by general laws. Or, to put it in another way, he starts with the fact of the variability of color in animals of both sexes and says that in the female, where greater protection is needed, the color is toned down or eliminated, while in the male, the need for protection being-less, the color may be preserved and intensified. Mr. Wallace has Supplemented this theory by another factor; he now holds that the frequent superiority, to use his own words, of the male bird or insect in brightness or intensity of color, even where the general coloration is the same in both sexes, is primarily due to the greater vigor and activity and the higher vitality of the male. This intensity of coloration becomes most developed in the male dur ing the breeding season when the vitality is at a maximum. The greater intensity of colors in the male, which' may be termed the normal sexual difference, would be furthen developed by the combats of the males for the possession of the4 peckham. [vol 1. 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."We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint). To get started finding Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
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Description: Excerpt from Observations on Sexual Selection in Spiders of the Family Attidae, And, Protective Resemblance in Spiders Mr. Wallace, in his well known essay on Colors of Animals, remarks that color per 36 may be considered, normal and needs no special. Accounting for; that amid the constant variations of animals and plants color is ever tending to vary and to appear where it is absent; and that natural selection is con stantly eliminating such tints as are injurious to the species while it preserves and intensifies such as are useful; and in opposition to Darwin he has argued that the sexual diversity of color, common in many animals, has its primary cause in the special need of protection for the female, which represses in her the bright colors that are normally produced in both sexes by general laws. Or, to put it in another way, he starts with the fact of the variability of color in animals of both sexes and says that in the female, where greater protection is needed, the color is toned down or eliminated, while in the male, the need for protection being-less, the color may be preserved and intensified. Mr. Wallace has Supplemented this theory by another factor; he now holds that the frequent superiority, to use his own words, of the male bird or insect in brightness or intensity of color, even where the general coloration is the same in both sexes, is primarily due to the greater vigor and activity and the higher vitality of the male. This intensity of coloration becomes most developed in the male dur ing the breeding season when the vitality is at a maximum. The greater intensity of colors in the male, which' may be termed the normal sexual difference, would be furthen developed by the combats of the males for the possession of the4 peckham. [vol 1. 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."We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint). To get started finding Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint)

Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint)

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