T.O Loo mis on Birds of Chester County, South Carolina. I t^ 



their general course, which was directly out to sea. There 

 was no going and coming from rookery to feeding places as in 

 Brandt's Cormorant. Their flight was all one way, parallel 

 with the coast-line that would lead southward. The specimens 

 taken showed that both the Dark-bodied and Pink-footed were 

 represented, the former predominating. After an hour or two 

 the fog began to break along the south shore, and as it rapidly 

 retreated seaward, the line of movement receded, the birds 

 keeping just without the denser mist. 



The arresting of the progress of a movement in a locality 

 would necessarily present the appearance of extraordinary migra- 

 tion — such as is often termed a 'bird wave.' An apparition of 

 this kind has been reported by Mr. Philip Cox (Auk, VI, p. 

 241). The actual stoppage of a vast army of Robins, Song 

 Sparrows, and Slate-colored Juncos by a snow storm was wit- 

 nessed by him one morning in April, 1SS5, near Newcastle, 

 New Brunswick. When occasion for migration was urgent its 

 interruption just below a locality in the northward movement or 

 just above it in the southward might be expected sometimes to 

 bring about a twofold result — scarcity or absence for a time in 

 the locality, as there would be no necessity for an early stop, and 

 a wave of augmented proportions in the territory in which the 

 first pause was made. The varying size of waves when the 

 highway of migration is clear may, perhaps, in part be thus 

 accounted for, by previous damming up and concentration. The 

 apparent smallness of a wave may not improbably be due some- 

 times to its centre of abundance not resting in a locality, it being 

 above or below or to one side of it during the halt. During the 

 reign of ice and snow, interruption of northward progress not 

 infrequently results in a regurgitated movement, when occurring 

 to the northward of this locality, as has been stated in previous 

 portions of this article, having the appearance of a wave from 

 below. In this connection, see 'Report on Bird Migration in 

 the Mississippi Valley,' pp. 29, 30. 



An exemplification of involuntary migration is seemingly 

 afforded in the great flight of Killdeers that appeared suddenly 

 along the New England coast in the latter part of November, 

 1S8S (Chadbourne, Auk, VI, p. 255). This movement was 

 apparently from the southward, in the path of a storm. 



