HEROES OF SCIENCE. 



BOTANISTS, ZOOLOGISTS, AND GEOLOGISTS. 



PROFESSOR R MARTIN DUNCAN, F.R.S., F.L.S., 



VICE I'RESIDENT OF THE GEOLOGICAL SOCIETY ; 

 HONORARY FELLOW OF KING's COLLEGE, LONDON. 



PUBLISHED UNDER THE DIRECTION OF THE COMMITTEE 



OF GENERAL LITERATURE AND EDUCATION APPOINTED BY THE 



SOCIETY FOR PROMOTING CHRISTIAN KNOWLEDGE. 



LONDON: 



SOCIETY FOR PROMOTING CHRISTIAN KNOWLEDGE 

 NORTHUMBERLAND AVENUE, CHARING CROSS; 



43, QUEEN VICTORIA STREET; 48, PICCADILLY; 

 AND 135, NORTH STREET, BRIGHTON. 



NEW YORK : E. & J. B. YOUNG AND CO. 

 1882. 



