

CHARLES DARWIN 



Charles Darwin published his first great book, " On the Origin of Species," in 1859. 

 This book was the outcome of over twenty years' work spent in collecting data on 

 problems relating to variation, heredity, competition, and survival in organisms. 

 Darwin's later publications and investigations were designed to vindicate and extend 

 the theories and facts contained in the " Origin of Species." It is safe to say that no 

 other scientific man ever exercised a greater influence on the thought and progress 

 of mankind. From Bergen and CaldwelFs " Introduction to Botany " 



