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Sir W. Thomson—General Ocean Circulation. 349 
Art. XLIT.—Remarks on the General Ocean Circulation ; by 
Str Wyvitite THomson. From his Address to the Geo- 
graphical Section of the British Association, at its recent 
It was pointed out long ago by Sir Charles Lyell that many 
of the most marked phenomena of the present physical condi- 
and that any physical phenomena affecting obvious! r- 
tion of its area must be regarded as one of an interdependent 
system of phenomena affecting the ocean as a whole. 
Shallow as the stratum of water forming the ocean is—a mere 
€ cause of natural phenomena, such as the movements of 
i areas of 
co 
abnormal temperature conditions, are always more or less com- 
plex, but in almost all cases one cause appears to be so ver 
much the most efficient that in taking a general view all others 
* Nature, August 22, 1878. 
