2)4 Dr. Hooker on American BoUtny, 



Michaiix, J. Bartiam, and a Mr. Tilden, from Hudson's Bay, 

 is in the Slierardian Herbarium at Oxford ; ihatof Plukenet, 

 if) the British Museum ; of Pallas, (in the possession of Mi% 

 Lambert,) ridi in the vegetable productions of northern 

 Asia, which, as is well known, bear a great affinity to those 

 of the northern parts of America; of Mr. Bradbury, which 

 was formed in Upper Louisiana, in the possession, we be- 

 lieve, of the Botanic Garden at Liverpool ; and of A. Men- 

 zies, Esq. which was selected, during that gentleman's voyage 

 with captain Vancouver, upon the N. W. coast of America. 

 Nor should the various collections be omitted which arc 

 found in the gardens of England, especially in the vicinity of 

 London. 



Thus prepared, the Flora Americts Septentrionalis, or a 

 ^jstemntic Arrangement and Description of the Plants of 

 Morth America, by Fk. Pursh, appeared in London in the 

 year 1813, with 24 well-executed plates of new species, in 2 

 vols. 8vo. The specific characters are in Latin, the obser- 

 vations in English. 



The arrangement is that of the sexual system ; but the 

 author has made considerable deviations from the generally 

 received arrangement of the Linnaean school. The classes 

 Dodecandria and Polyadclphia are omitted, as well as Monce- 

 dti, DitPcia, and Polygamia; and their genera are referred to 

 other classes, some according to the number of stamens, 

 others to his 19th class, whii h is called Diclinia, and which 

 contains Euphorbiaceoi, Amentacem, and Coniferce; thus bring- 

 ing into his arrangement a union of a natural and artificial 

 system, which has not been adopted by others. 



Michaux's work included the whole of the class CryptogU' 

 mia ; but this, though all perhaps that was then known, con- 

 tained so scanty a list as scarcely to deserve notice. Mr. 

 I*tirsh professes to go no farther than the order Filices of the 

 c'lass Cryptogamia. 



Sometime after the publication of his Flora, the author 

 again visited America, but with a view of confining his re- 

 searches to a part which had been very little explored, namely 

 Canada. There he died in 1820, His herbarium of that 

 country, which was considerable, has been purchased by Mr. 

 Lambert, who, we believe, is also the possessor of that far 

 more'extensive and valuable one which Pursh had made in 

 his former trareb in the United States. 



