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Show viii CONTENTS OF VOL. I. CHAPTER IX. SECONDARY SEXUAL CHARACTERS IN THE LowER CLASSES OF THE ANIMAL KINGDOM. These characters absent in the lowest classes-Brilliant coloursMollusca- Annelids- Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity-Spiders, sexual colours of; stridulation by the males-Myriapoda Page 321-340 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 beL ween the sexes- 'l'hysanura -Diptera- Hemiptera- Homoptera, musical powers possessed by the males alone- Orthoptera, musical instruments of the males, much diver~ified in structure ; pugnacity ; colours - N europtera, sexual differences in colour- Hymenoptera, pugnacity and colours-Coleoptera, colours; furnished with great horns, apparently as an ornament; battles; stridulatin<z organs generally common to both sexes . . 341-385 CHAPTER XI. INSECTS, continued.-ORDER LEPIDOPTERA. Courtship of butterflies- Battles- 'l'icking noise- Colours common to both sexes, or more brilliant in the males- ExamplesNot due to the direct action of the conditions of life- Colours adapted for protection - Colours of moths- Display- Perceptive powers of the Lepidoptera~ Variability~ Causes of the difference in colour between the males and females-Mimickry, female butterflies more brilliantly coloured than the malesBright colours of caterpillars- Summary and concluding remarks on the secondary sexual characters of insects- Birds and insects compared . . 386-423 THE DESCENT OF MAN; AXD ON SELECTION IN RELATION TO SEX. INTRODUCTION. ~ruE nature of the following work will be best unders\. cmd by a brief account of how it came to be written. During many years I collected notes on the origin or descent of man, without any intention of publishing on the subject, but rather with t]~e determination not to publish, as I thought that I should thus only add to the prejudices against my views. It seemed to me sufficieut to indicate, in the first edition of my ' Origin of Species,' that by this work "light would be thrown on " the origin of man and his history ;" and this implies that man must be included with other organic beings in any general conclusion respecting his manner of appearance on this enrth. Now the case wears a wholly different aspect. When a naturalist like Carl Voat Ycn- o tures to say in his address as President of the National Institution of Geneva (1869), "personne, en Europe "au moins, n'ose plus soutenir la creation independante " et de toutes pieces, des espcces," it. is manifest that at least a large number of naturalists must admit that !<pecies are the modified descendants of other species ; VOL. I. B |
