ADVERTISEMENT. 
ED | | Co 
THIS Work being now completed, we conceive 
our engagement with the Subfcribers, is, in every refpect 
fulfilled, and that it only remains to embrace this opportunity, 
to repeat our thanks for their favours ; and in particular, for 
the candour with which the Supplementary Part has been 
received, 
But, in fubmitting the work to the Public in general, as 
an illuftration of an important branch of Britifh Zoology, it 
1s incumbent on us, to ftate briefly, the nature, and extent of 
the undertaking, the information it contains, and its peculiar 
advantages. In this retrofpective furvey of the work, we 
muft advert to our former obfervations ; fome fimilar re- 
marks appeared at the conclufion of the fourth volume, and 
we retrace thofe, as they immediately relate to the outline of 
our defign. 
A Ornithology, 
