One Vol., Royal 8vo. 30s. 



HELIGOLAND 



AS AN 



ORNITHOLOGICAL OBSERVATORY 



THE RESULT OF FIFTY YEARS' EXPERIENCE 



BY 



HEINRICH GATKE 



CORRESPONDING MEMBER OF THE ZOOLOGICAL SOCIETY OF LONDON, HONORARY MEMBER OF 1 



BRITISH ORNITHOLOGISTS' UNION, AND OF THE AMERICAN ORNITHOLOGISTS' UNION, HONORARY 



MEMBER OF THE NORFOLK AND NORWICH NATURALISTS' SOCIETY, OF THE 



ORNITHOLOGISTS' UNION OF VIENNA, AND THE HUNGARIAN ORNITHOLOGICAL 



CENTEALE, AND MEMBER OF THE PERMANENT ORNITHOLOGICAL COMMITTEE 



TRANSLATED BY 



RUDOLPH ROSENSTOCK, M.A. OXON. 





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EDINBUEGH: DAVID DOUGLAS, 10 CASTLE STREET 



1 895 



