This photograph is taken from an old print of William Harvey explaining 

 to some scientists how blood circulates in the body. Why was Harvey's dis- 

 covery so important ? Do you know the names of any scientists, natural- 

 ists, and physicians who made discoveries that have made possible much 

 of our knowledge in science today ? 



Culver Service 



UNIT XX 

 WHO ARE SOME OF THE MAKERS OF BIOLOGY? 



Preview. This unit is intended primarily for reference and 

 should be used in connection with the other units of work. When, 

 for example, you are studying about bacteria, read here and else- 

 where on the life of Louis Pasteur. Every bird-lover should know 

 something about the life of Audubon. Modern applications of 

 biology to plants and animals are intimately connected with the 

 names of Mendel and Burbank. 



If we were to attempt to group the men associated with the 

 study of biology, we should find that in a general way they are 

 connected either with discoveries of a purely scientific nature or 



