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XIX. On £Ae Mineralogy of Disko Island. By Sir Charles 

 Giesecke', F. R. S. Edin. M.R. I. A, Professor of Mine- 

 ralogy to the Royal Dublin Society, and Member of the 

 Royal Societies of Copenhagen, Upsal, &c. &c. 



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(Read April 4. 1814.) 



JJlSKO Island, (see Plate XV.), is situated in front of a bay 

 in the continent of Greenland, within Davis' Strait, known by 

 the name of Disko Bay y which is sometimes called, particularly 

 in the old Dutch charts, Sydost Bay. This name is derived from 

 an immense curvature, screened by innumerable islands,made in 

 the continent by the sea. Disko Island is situated in 69° 14' of N. 

 latitude. It is distant from the continent towards the south 12 

 German miles ; on the west and north it is surrounded by the 

 sea of Davis' Strait ; and on the east, it is separated by a nar- 

 row sound, distinguished by the name of Waygat by the Dutch, 

 and by the Greenlanders Ikareseksoak. It stretches north- 

 ward from 69° 14' to 70° 24' ; and its greatest breadth, which 

 is from Fortune Bay on the west, to Flakkerhuk, so named by 

 the Dutch, on the east, is 10 German miles. 



The whole of Disko Island belongs to the flcetz-trap forma- 

 tion, which extends over part of the continent, beyond the 

 Waygat, and shews itself on the other side^t 69° 20' of N. 

 Lat. continuing towards and occupying the peninsula of Noon- 

 soak, which separates Disko Bay from the Bay of St James, 

 called by the Dutch Stikkende Jakob's Bay. On the east end 



VOL. IX. P. II. l 1 of 



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