HISTORICAL SKETCH. 
9 
Emmons, Cooper, Torrey, Leavenworth, Mitch- 
ell, Pickering, Boykin, Short, Peters, H. H. 
Eaton, Loomis, Cooley, Clinton, Booth, Leitner, 
the two brothers Green and Leconte with some 
others. Several are yet living and may do 
more hereafter. 
Those who have never published any thing, 
altho’ they collected Herbals, and were practi- 
cal Botanists, are chiefly Collins, Miller, Wray, 
Pitcher, Hall, Vanvleck, Lyons, Herbemont, 
Habersham, Squib, Enslen, Boykin, Williams, 
Hitchcock, Hingston, Ingalls, Simmons, Gri- 
swold, Gates, Whitlow, Knevels,Steinhauer,Gais- 
senhauer, Durand, Griffith, Fisher, Mac Wil- 
liams, with many others mentioned by Elliot, 
Hooker and Eaton as having helped their labors. 
These collectors are often very useful to the 
others by imparting specimens, localities and 
facts : their number is increasing, and several 
may yet become writers or improvers. 
It is from such that I have received much 
help by gifts or exchanges of specimens, new 
facts and observations. I have reckoned par- 
ticularly among my friends and assistants, Col- 
lins, Durand, Miller, Short (2 brothers and a 
sister) Walton, Hall, Carr, Hingston. Mac Wil- 
liams, Vanvleck, Gaissenhauer, Ward, Mease, 
Bradbury, Kin, Ridgely, Mrs. Holley born 
Austin, Hart, Crocket, Limner, Duval, Law- 
rence, Knevel, &c. 
But I have received also many specimens 
from professed Botanists, Muhlenberg, Torrey, 
Beck, Schweinitz, Elliot, Cutler, Eaton, Brad- 
bury, Brickell, Halley. Short, Eddy &?c. all 
American Botanists, chiefly by exchanges of 
my own or purchases; besides some Ameri- 
can plants received form foreign Botanists 
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