COBBECTIONS TO THE PRESENT EDITION 



First Edition 

 Vol. I. 



Present Edition 



Vol. I. 



Page 



275-276 



290 



401 



412 

 417 



Vol. H 



2 



Page 



295-297 



'310 



414 



421-423 



424 



Vol. n. 

 432 



Grreater variability of male than 

 female; direct action of the en- 

 vironment in causing differ- 

 ences between the sexes. 



Period of development of pro- 

 tuberances on birds' heads de- 

 termines their transmission to 

 one or both sexes. 



Causes of excess of male births. 



Proportion of the sexes in the 

 bee family. 



Excess of males perhaps some- 

 times determined by selection. 



Bright colors of lowly organized 

 animals. 



Sexual selection among spiders. 



Cause of smallness of male 

 spiders. 



Use of phosphorescence of the 

 glow-worm. 



The humming noises of flies. 



Use of bright colors to Hemip- 

 tera (bugs). 



Musical apparatus of Homoptera. 



Development of stridulating ap- 

 paratus in Orthoptera. 



Herman Miiller on sexual differ- 

 ences of bees. 



Sounds produced by moths. 



Display of beauty by butter- 

 flies. 



Female butterflies, taking the 

 more active part in courtship, 

 brighter than their males. 



Further cases of mimicry in but- 

 terflies and moths. 



Cause of bright and diversified 

 colors of caterpillars. 



Brushlike scales of male Mallo« 

 tus. 



