188 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



beiug carried on under the direction of Captain Hoffmann, 

 II. M. S. Dolphin, and in the Baltic by Capt. -Lieutenant Holz- 

 liauer, II. M. S. Drache, who are working in unison with the 

 triangulating and topographic parties on shore. 



As might have been expected, this great undertaking is 

 being carried on with all possible accuracy and minuteness. 



The publication of the Anuale/i der Hydrographie, contain- 

 ing many valuable reports of the commanders of German 

 men-of-war in foreign waters on hydrographic matters, has 

 been continued. 



Sailing directions for the coasts of the Skagerrack, the Cat- 

 tegat, and the Belts are in course of publication, and are be- 

 ing carefully compiled for the whole German coast. 



The work of the Norwegian Exploring Expedition in the 

 North Atlantic, under direction of Professor Mohn and Cap- 

 tain Wille, has been steadily prosecuted. 



The results of the soundings with the temperature and 

 current observations of last year, including all the soundings 

 taken between Iceland, Greenland, and the British Isles since 

 18C0 by British, German, and Norwegian vessels, are given 

 in a chart by Professor Mohn, physicist to the expedition 

 {Nature, Oct. IS, 18m). This chart shows isobathal curves 

 at intervals of 100 fathoms, giving a detailed representation 

 of the configuration of the sea-bottom. 



This year the expedition left Troinso July 24, returning 

 August 23. Sounding and dredging were effected between 

 the Lofoden Islands and Jan Mayen, a careful survey of the 

 latter island being made. 



The boundary between the polar current and the warm 

 Atlantic current was found to be very steep, like that called 

 the "cold wall" on the American coast. Next year the ex- 

 pedition will work up the region between North Cape, Jan 

 Mayen, and the north of Spitzbcrgen. 



In a paper in the May (18V7) number of Petermann's Mit- 

 theilungen, Dr. Dorst furnishes a valuable addition to the 

 knowledge of currents of the region between Greenland and 

 Spitzbergen, by a discussion of the movements of the ice as 

 observed by him in 1869. 



Dr. Petermann has been furnished by Captain David Gray 

 with a large amount of material for the determination of 

 mean surface temperature of the Greenland and Norwegian 



