viii Table of the Principal A dditions and 



First 

 Edition. 



Vol. I. 



Page 

 149 



150 



169 



180 



193 



208. note. 

 209 



239 

 245 

 250 

 256 



275-6 



290 



301 

 314 



315 



327 

 338 

 339 

 345 

 349 

 350 

 351 

 854 

 359 



3G6 



387 

 397 



401 

 412 

 417 



Present 

 Edition. 



Page 

 57 



58-9 



134-5 



143 



151 



161, note 

 163 



188 190 

 195-6 

 199-206 

 209-210 



224-5 



235 



243-4 

 254 



255-6 



264 



272 

 273 

 277 

 280 

 281 

 282 

 284-5 

 288, note. 



292-3 



308 

 315 



319 



324-5 



326 



("Belt on advantages to man from his hair- 



\ lessness. 



(Disappearance of the tail in man and certain 



\ monkeys. 



( Injurious forms of selection in civilised 



\ nations. 



(Indolence of man, when free from a struggle 



\ for existence. 



(Gorilla protecting himself from rain with his 



\ hands. 



Hermaphroditism in fish. 



Rudimentary mammae in male mammals. 

 (Changed conditions lessen fertility and cause 

 \ ill-health amongst savages. 

 (Darkness of skin a protection against the 

 \ sun. 



jNote by Professor Huxley on the develop- 

 \ ment of the brain in man and apes. 

 ("Special organs of male parasitic worms for 

 \ holding the female. 



Greater variability of male than female; 

 direct action of the environment in causing 

 differences between the sexes. 



Period of development of protuberances 

 on birds' In ads determines their trans- 

 mission to one or both sexes. 



Causes of excess of male births. 



Proportion of the sexes in the bee family. 

 (Excess of males perhaps sometimes deter- 

 ^ mined by selection. 



Bright colours of lowly organised animals. 



Sexual selection amongst spiders. 



Cause of smallness of male spiders. 



Use of phosphorescence of the glow-worm. 



The humming noises of flies. 



Use of bright colours to Hemiptera (bugs). 



Musical apparatus of Homoptera. 

 ("Development of stridulating apparatus in 

 \ Orthoptera. 



("Hermann Miiller on sexual differences ol 

 \ bees. 



Sounds produced by moths. 



Display of beauty by butterflies. 

 ("Female butterflies, taking the more active 

 \ part in courtship, brighter than their males. 

 ("Further cases of mimicry in butterflies and 

 \ moths. 



(Cause of bright and diversified colours of 

 \ caterpillars. 



