54 



THE POPULAR SCIENCE MONTHLY 





Fig. 6. Entrance of the Linnm5an Greenhouse at the Missouri Botanical 



Garden, St. Louis, Missouri ; showing the three busts of 



Linnaeus, Gray and Nuttall. 



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 



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