BOTANY AT ST. LOUIS 54 
Fic. 6. sera OF THE LINN/AN GREENHOUSE AT THE epicceine BorTaNIcaL 
GARDEN, St. Louis, Missour1; showing mig three busts 
Linneus, Gray and Nuttal 
99 
for his “ Genera of the North American Plants,” which did not appear 
until 1818. Nuttall himself set most of the type for this work. In 
1818 he started from Philadelphia for Arkansas, reaching Fort Belle- 
point on April 24, 1819. He made this his center of operations, ex- 
ploring in various directions and making large collections. He was 
taken sick with fever and on recovering made one more excursion and 
then set out for home, reaching New Orleans February 18, 1820. At 
this time he had made a journey of over five thousand miles through a 
country still in the undisputed possession of the Indians, and almost 
wholly unexplored by scientific men. Immediately upon his return to 
Philadelphia in 1820 he began to study his collections and to write his 
