THE OKIGIN OF SPECIES 



BY MEANS OF NATURAL SELECTION, 



OR THE 



PRESERVATION OF FAVOURED RACES IN THE STRUGGLE 



FOR LIFE. 



By CHARLES DARWIN, M.A., F.R.S., &c. 



SIXTH EDITION, WITH ADDITIONS AND CORRECTIONS. 



{ELEVENTH THOUSAND.) 



LONDON: 

 JOHN MUEEAY, ALBEMARLE STEEET. 



1872. 



The right of Translation is reserved. 





