8 MODERN BIOLOGIC THERAPEUSIS 



namely, Galen (131-201 A.D.) the founder of 

 experimental medicine. He gave us the four 

 classic symptoms of inflammation; differenti- 

 ated pneumonia from pleurisy; was the first to 

 mention aneurysm and describe the different 

 forms of phthisis. While Galen was little of an 

 anatomist, he was the first and only experi- 

 mental physiologist before Harvey. The most 

 commanding figure in European medicine after 

 Galen and before Harvey was Vesalius (1514- 

 1564), who alone made anatomy what it is to- 

 day a living working science. 



The seventeenth century was the great age of 

 specialized anatomic research and was notable 

 for a large array of individual discoveries and 

 investigations, nearly every one of which had a 

 physiologic significance. The greatest name in 

 seventeenth century medicine is that of Wil- 

 liam Harvey (1578-1657) who discovered the 

 circulation of the blood. The lacteal vessels 

 were discovered by Vaselli in 1622. 



The Microscope The invention of the com- 

 pound microscope by Leeuwenhoek in the latter 

 half of the century opened out a new field for 



