VI. 



migration, than the veteran author ; and the results of his 

 fifty years or more of labour, as now presented to the notice 

 of the ornithological world, are eloquent testimony to the untiring 

 zeal and energy of an accomplished field naturalist. 



The opinions he expresses, on the special department of 

 ornithological science, for the study of which Heligoland is so 

 pre-eminently adapted, will naturally have the greatest weight 

 with all, and some in their admiration for the veteran observer 

 have formed the opinion, that all, or nearly all of our previous 





