The descent of man, and selection in relation to sex / by Charles Darwin.

  • Darwin, Charles, 1809-1882.
Date:
1901
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The descent of man, and selection in relation to sex / by Charles Darwin. Source: Wellcome Collection.

    18/1060 (page XIV)
    xiv CONTENTS. PAET II. SEXUAL SELECTION. CHAPTER VIIL Peinoiples of Sexual Seleotion. pvgb Secondary sexual characters—Sexual selection—Manner of action—Exceas of males—Polygamy—The male alone generally modified through sexual selection—Eagerness of the male—Variability of the male—Choice exerted by the female—Sexual compared with natural selection—Inheri¬ tance at corresponding periods of life, at corresponding seasons of the year, and as limited by sex—Relations between the several forms of inheritance—Causes why one sex and the young are not modified through sexual selection—Supplement on the proportional numbers of the two sexes throughout the animal kingdom—The proportion of the sexes in relation to natural selection . . , 319 CHAPTER IX. Secondary Sexual Chabaotees in the Lowes Classes of the Animal Kingdom. These characters are absent in the lowest classes—Brilliant colours—Mollusca—Annelids—Crustacea, secondary sexual characters strongly developed ; dimorphism ; colour ; characters not acquired before maturity—Spiders, sexual colours of ; stridulation by the males—Myriapoda . . 400 CHAPTER X. Secondary Sexual Characters of Insects. Diversified structures possessed by the males for seizing the females — Differences between the sexes, of which the meaning is not understood—Difference in size between the