NATURAL HISTORY, 
trees ;—is occasionally found up rivers, at a 
considerable distance from sea, It has a crest, 
which it loses mm winter. 
2 P. Cristatus. Temm. Orn. 2. p. 900. 
(Cargo Crisratus.) The crested Corvorant. 
Very rare, but not clearly ascertained whether a 
variety of the next, or a distinct species. 
3. P. Gracuxrus. (Lin.) Brit. Zool. 2. p. 610. 
The Shag. Common. 
4. P. Bassanus. (Lin.) Brit. Zool. 2. p. 612, 
The Gannet. We have occasionally seen this 
bird within the district, a solitary winter visitant. 
The locomotive powers possessed by the greater 
part of this most interesting class, ‘often cause us to 
be agreeably surprised by visits from species, that 
belong to distant regions, as the preceding list 
sufficiently proves ; in which, tho’ many rare birds 
have a place, we have been careful to admit none, 
but such as have been well-authenticated, by accu- 
rate and competent naturalists. These accidental 
visitors however,—tho’ highly interesting, have no 
claim, in a philosophic view of the geographical 
distribution of species to a regular place in the 
Fauna of a district, which, strictly speaking, ought 
to be confined to permanent residents, and regular 
periodical visitants.—The migrations of these last, 
have formed a subject of anxious investigation to 
many able naturalists ;—no inconsiderable portion 
for instance, of that delightful work, the Natural 
History of Selborne, is so eccupied ;—yet much 
