The Hydrography of the Faeroe- Shetland Channel 91 



the North Sea. The entrance to the North Sea is probably effected 

 every year, as there is no opposing northerly current on the western 

 side. In the Faeroe -Shetland Channel the southward movement is 

 normally prevented by the northerly currents 1 and 2, except at 

 depths below 300 fathoms, where the northward currents are cut 

 off by the Wyville-Thomson ridge, and at the surface, where there 

 may be a southerly drift current. In exceptional cases, as in 1902, 

 the northerly movement may be in abeyance, and water may move 

 southward at all depths. It seems likely that the presence of this 

 water in the North Sea has a special bearing on biological and fishery 

 questions. 



7. The movements of the surface waters of the sea and the tem- 

 perature of the air near the British Isles do not stand in any direct 

 relation of cause and effect. Northerly winds bring cold weather, and 

 by drifting and ' banking ' cold water from higher latitudes, bring cold 

 surface water with them. Southerly winds bring warm weather, and 

 bring warm water from low latitudes in the same way. The tempera- 

 ture of the surface water in the open sea influences the distribution of 

 atmospheric pressure, as Pettersson has shown, and it will therefore 

 affect the direction of the prevailing winds, but motion has nothing to 

 do with this influence. 



TABLE I. 1 



List of ' Walwin ' Stations. 



Station. 



Lat. N. 



Long. W. 



Station. 



Lat. N. 



Long. W. 



Al 



60 40 



2 50 



A10 



60 17 



3 5 



A2 



60 54 



3 40 



All 



60 27 



3 50 



A3 



61 16 



4 41 



Bl 



60 51 



6 22 



A3£ 



61 28 



4 50 



B2 



60 17 



6 22 



A4 



61 32 



5 20 



B3 



59 46 



6 20 



A5 



61 45 



6 02 



B4 



60 00 



5 20 



A6 



61 34 



6 20 



III. 



Off Fitful I 



ead. 



A7 



61 14 



■■ 6 08 



IV. 



West of Yell sound. 



A8 



61 00 



5 30 



V. 



Off Flugga L. H. 



A9 



60 45 



4 50 



VI. 



East of Bressay. 



1 For numbers and positions of the Jackal stations in 1893 and 1902, see ' Twelfth Report 

 of the Fishery Board for Scotland,' p. 364, and Nature, vol. lxvi., p. 654. 



12—2 



