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Preface* 
1 have been guided by the hints given by the learned 
Dr. J. E. Smithy in his excellent u Introduction to Bo- 
tany.’ 5 The classes Dodeeandria and Polyadelphia are 
entirely omitted* and their genera inserted in their pro- 
per places in the other classes» Asarum next to Axis - 
tolochia, in Gynandria. Bejaria, Portulacca , Talinum % 
Calli gonum, and Hypericum , in Polyandria. Hudson 
nia next to Hellanthemum * with which it is closely 
related in the same class* Decumaria, Ly thrum, Cu -• 
phea * and Agrimonia * in Icosandria. Halesia near 
Styrax * in Monadelphia. Euphorbia in Diclinia* where 
it forms* with its other genera* a natural as well as ar- 
tificial orders The nineteenth class* Diclinia* contains 
the natural families of Tricoccse or Euphorbia* Amen- 
tacess* and Coniferae. The other genera of the classes 
Monoecia* Dioecia, and Polygamia* having been re- 
ferred to their proper classes. The genus Diotis more 
properly belongs to Tetrandria*but had been omitted in, 
that class. Najas and Valisneria are genera of an 
order of this class* to which probably might be added 
all the Aroideae. How far these alterations may meet 
the approbation of those best qualified to judge* I have 
yet to learn* but I am strongly persuaded they will 
facilitate the study of this lovely science to the young 
beginner. 
In the last class* Cryptogamia* I have gone no further 
than the family of the Filices * according to the forma- 
tion of the plan of this work* which only included 
plants which either are* or can be cultivated. The other 
orders* Musci * Algce * and Fungi * will form a distinct 
Work from the present* and may appear at some future 
