PREFATORY REMARKS. 
cclxiii 
of the new or imperfectly known genera and species ; the only indication left of my intention 
to treat any of the subjects alluded to being a greater number of references to authors 
than is absolutely necessary for the present list, though essential to my original design. 
Witli this more limited plan, and with its execution, as far at least as regards the deter- 
mination of several of the species, I am so little satisfied, that had the publication depended 
entirely on myself, and related solely to the present essay, I should have deferred it stUl 
longer, probably until the return of Captain Parry from the arduous enterprise in which 
he is now embarked. 
I have, however, to expi'ess my regret for the delay that has already taken place, as it 
has prevented the appearance of the valuable memoirs in other departments of Natural 
History, which have been long ready for publication ; and also as it has till now deprived 
Botanists of the excellent figures so admirably Illustrating the structure of the plants 
selected for engraving, and for Avhlch it is hardly necessary to add that I am indebted to the 
friendship of Mr. Bauer. 
