3H 



INDEX 



Bustard, Great, display of, 107 

 Butterflies, courtship of, 195 



— excess of males in, 192 



— experiments on, 205 



— and female choice, 193 



— females larger than males, 193 



— fighting between, 194 



— fragrance of, 200 



— males mobbing females, 196 



— methods of pairing, 204 

 ■ — scent scales of, 199 

 Butterfly, Small-blue, method of 



folding wings of, 187 



Caiman, Dr. W. T., on Apus, 



306 

 Campbell on courtship of spiders, 



247 

 Cassowary, roar of, 112 

 Castration, efifects of, 144 

 Chamaeleons, armature of, 167 

 Cicada, music of, 222 

 Cockles, blindness of, 274 

 Coloration, cause of iridescent, 



189 



— forms of, 186 

 Conger-eel, huge size of females 



in, 178 



Cooke, Mr* John, and the beha- 

 viour of sheep, 69 



Courtship, meaning of, 21 



Crabs, courtship of, 258 



— seizing mates, 260 



— stridulating organs of, 255 

 Crane, dances of, 120 

 Crocodile, courtship of, 164 

 Cunningham, J. T., and secon- 

 dary sexual characters, 14 



Dancing in birds, 119 

 Darwin, his theory of Sexual 

 Selection, 12 



Darwin on coloration of beetles, 

 210, 211 



— on coloration of mollusca^ 



275 



— on " horns " of beetles, 212 



— on mane of baboons, 44 



— on sexual selection in butter- 

 flies, 194 



Deer, antlers of, 53, 62 



— courtship of, 5 3 



— fatal encounters of, 55 



" Diathetic " types, meaning of, 



50 

 " Display," function of, 183 



— in birds, need of, 147, 149 

 Double-eyed fish, 176 

 Dragon-flies, antiquity of, 227 

 Dragonet, courtship of, 177 



Eland, horns of, 65 



— strange habits of, 68 

 Elephant, courtship of, 71 



— remarkable scent glands of, 

 69 



— use of tusks in, 70 

 Elephant-seal, courtship of, 87 

 Emotions and human evolution, 



32 



— and sexual selection, 17 

 Emu, air-sacs of, 112 

 Eunuchs, peculiar features of, 



145 

 Extinction, causes of, 17 



Fabre on courtship of scor- 

 pions, 252 



Fashions among savages, 33 

 et seq. 



Fighting-fish, ferocity of, 182 



Fish, disparity in size of sexes 

 178 



