Roberto Valturio (1405-1475)Archimedes (ca.287-212 B.C.)Agricola (1494-1555)Agostino Ramelli (1531-ca.1600)Galileo Galilei (1564-1642)Isaac Newton (1642-1727)Benjamin Franklin (1709-1790)Antoine Laurent Lavoisier (1743-1794)Alexander Wilson (1766-1813)Thomas Say (1787-1834)William P.C. Barton (1786-1856)John Torrey (1796-1873) and Asa Gray (1810-1888)John James Audubon (1785-1851) and John Bachman (1790-1874)Andrew Jackson Downing (1815-1852)![[Contents]](images/contents.gif)