ON THE 



ORIGIN OF SPECIES: m\ 



OR, 



THE CAUSES OF THE PHENOMENA 



OF 



ORGANIC NATURE. 



31 flours* of $\% Sfcrfarre to latorltinfl lUm 



BY 



THOMAS H. HUXLEY, F.R.S., F.L.S., 



PROFESSOR OF NATURAL HISTORY IN TUE JERilYN STREET 8CI100L OF MINES. 



NEW YQKK: 

 D. APPLETON AND COMPANY, 



549 & 551 BROADWAY. 



1878. 



