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and double-crested cormorant in Maine. Auk, 48: 589-92. 

 Ober, F. a. (1880). Camps in the Caribbees. Boston. 

 CiAFSSON, E. and Palsson, B. (1772). Reise igiennem Island. Soroe. 

 (i774"75)' Reise durch Island. Copenhagen and 



Leipzig. 

 (1802). Voyage en Islande, . . . Paris, 5 vols., transl. 



of above by Gauthier-de-Lapeyronie. 



(1805). Travels in Iceland: performed by order 



of his Danish Majesty . . . , by Messrs. Olafsen and Povelsen. Translated from 



the Danish. London, Richard Phillips's Collection of Modern and Contemporary 



Voyages and Travels, vol. 2: no. i; 162 pp. 

 Olavius, O. (1780). Oeconomisk Reise igiennem de nordvestlige, og nordlige og 



nordostlige Kanter af Izland. Kobenhavn, 2 vols. 

 Palmer, R. S. (1941). A behavior study of the common tern {Sterna hirundo hirundo 

 ' L.). Proc. Boston Soc. Nat. Hist. 42: 1-119. 



(1941b). White-faced terns. Auk, 58: 164-78. 



(1949). Maine birds. Based largely on data gathered by Arthur 



Herbert Norton. Bull. Mus. Comp. ^ool. 102: 656 pp. 



(1950). Corrigenda to Maine birds. Bull. Maine Audubon Soc. 6: 20. 



Paludan, K. (1947). Aiken. Kobenhavn, Munksgaard. 



(1951). Contributions to the breeding biology oi Larus argentatus and 



Larus fuscus. Vidensk. Medd. Dansk naturh. Foren. 114: 1-128. 



Parry, W. E. (1824). Journal of a second voyage for the discovery of a north- 

 west passage from the Atlantic to the Pacific; . . . London. 



(1828). Narrative of an attempt to reach the North Pole, . . . London. 



Patten, C. J. (1902). The aquatic birds of Great Britain and Ireland. London. 

 Pearson, T. G., Brimley, C. S. and Brimley, H. H. (1919). Birds of North CaroHna. 



Raleigh, N. C, N.C. Geol. & Econ. Surv., vol. 4. 

 Pedersen, a. (1930). Fortgesetzte Beitrage zur Kenntnis der saugetier- und 



Vogelfauna der Ostkiiste Gronlands .... Medd. Grenland, yy: 341-508. 

 Perry, R. (1940). Lundy isle of puffins. London, Lindsay Drummond. 

 ■ (1948). Display of the arctic skua. Country Life, 103: 375. 



(1948b). Pirate gull of the Shetlands. ibid. 104: 84-85. 



(1948c). Shetland sanctuary. London, Faber & Faber. 



(1950). The young gannet. Brit. Birds, 43: 343-44. 



Peters, H. S. and Burleigh, T. D. (1951). The birds of Newfoundland. St. John's, 



Dept. Natural Resources. 

 Peters, J. L. (1931). Check list of birds of the world. Cambridge, Mass., Harvard 



University Press, vol. /. 



(1934)- vol. 2. 



Peterson, R. T. (1950). Birds over America. New York, Dodd, Mead & Co. 



Pitt, F. (1929). Notes on the effect of temperature upon the breeding behaviour 

 of birds, with special reference to the northern golden plover {Charadrius apricarius 

 altifrons), and the fieldfare {Turdus pilaris). lbs (12) 5; 53-71. 



Plath, K. (1914). With the tropic-birds in Bermuda. Ibis (10) 2: 552-59, pis. 21-24. 



Pleske, T. (1928). Birds of the Eurasian tundra. Mem. Boston Soc. Nat. Hist. 6: 

 107-485. 



