INTERNAL MIGRATIONS. 147 



it migrates north across the Equator to the northern 

 coasts of the Indian Ocean; in the Athintic, as high 

 as the West Indies, New York, and the British 

 Islands (where flocks are occasionally observed) ; 

 in the Pacific, as high as Peru and Chili, and 

 possibly much further. From May onwards this 

 Petrel is one of the commonest birds met with in 

 the Atlantic by the various Liners that cross from 

 Europe -to the States. Wilson's Petrel arrives at its 

 Antarctic breeding-places in November, and stays 

 for a period of about five months until the young 

 are safely reared, then migrates northwards to enjoy 

 a second summer in the Northern Hemisphere, but 

 not to breed. Our second instance is that of the 

 Sooty Shearwater [Puffinus griseus), whose only 

 known breeding-place at the present time is the 

 Chatham group in nearly the same latitude as 

 Kerguelen, but in ths South Pacific. It migrates 

 northwards after the breeding season, and has then 

 been met with as high in the Northern Hemisphere 

 as the coasts of Newfoundland, Labrador, and 

 Greenland, the Faroes, and the British Islands ; 

 whilst in the Pacific it is known to range as high 

 as California. Our third instance is the Collared 

 Petrel (CEstrelala torrjuata), a species breeding in 

 the New Hebrides, 2000 miles south of the Equator, 

 which also comes north to winter, and has been 

 obtained off the British coasts so recently as 

 November 1889. That this species is thoroughly 

 a Southern Hemisphere one seems proved by the 

 fact that this latter example icas in moult. Another 



