178 
He has, likewise, a copy of the two following, rare 
Botanical Classical works to dispose of. 
Persoon Synopsis Plantarum. Two vols.—Price 10 
dollars. 
Vitman Summa Plantarum. Six vols. 8vo.—Price 
9 dollars. 
Pie offers to exchange any of his works, including 
this, and sets of the American Monthly Magazine and 
Critical Reviezv, for any work on Natural Sciences, 
with the authors thereof, and he will take several 
copies of any late or new work, on those conditions. 
Should any one send him specimens of plants, from 
Louisiana or elsewhere, he will furnish in return their 
proper names, or northern plants in exchange. He 
invites gentlemen residing in Louisiana and the western 
states, to collect every thing they meet, drying the 
specimens between sheets of coarse paper : should 
they only be superficially acquainted with Botany, by 
sending duplicates of their specimens, they may ascer¬ 
tain at once what grows in their neighbourhood, and 
make many discoveries. 
Such specimens, or any package and letters, must 
be sent by private conveyances, and may be left in 
New York, at the office of the American Monthly 
Magazine, Wall-street. 
