1 8 INTRODUCTION 



in the Vicinity of Quincy, Florida, and Gray, 

 with W. S. Sullivant, published a beautiful little 

 work on the Mosses of the Alleghanies, both 

 works coming out in 1846. 



Pioneer work has been shown making rapid 

 advances into volumes even now esteemed as 

 classics. Every botanist uses Gray's Manual of 

 Botany, 1848, which has gone through so many 

 editions, and some may be fortunate enough to 

 possess a first edition of his first volume of Genera 

 Florae Americae Boreali-orientalis f Illustrata, 

 1848, "designed to illustrate by figures and 

 analyses, the genera of the plants of the United 

 States." 



It has been difficult not to write also concerning 

 English medical botanists whose scientific and 

 social life touched so closely on that of congenial 

 fellow-workers in America. The names of two 

 men, John Coakley Lettsom (1744-1815) and 

 John Fothergill (1712-1780), figure constantly 

 in the records of our early medical colleges, and 

 in the correspondence of our pioneer botanists. 

 Fothergill was constantly consulted as to the 

 choice of books to be sent over here, and gave 

 generously to any doctor who coveted the speci- 

 mens in his botanical garden. " The younger 

 Linnaeus distinguished a plant of the class Poly- 

 andria digynia, natural order Hamamelaceae, by 

 the name of Fothergilla " (Darlington) , and was 



