OCEANOGRAPHY 



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year. It was shown by the Atlantic Expedition of the Michael 

 Sars in 1910 that the central part of the North Atlantic was con- 

 siderably colder in 1910 than in 1873, when the Challenger Expedi- 

 tion made investigations there; but the temperatures in 1910 



Fig. 13. — Temperatures at One of the "Fram's" and One op the 

 "Challenger's" Stations, to the South of the 

 South Equatorial Current. 



were about the same as those of 1876, when the Challenger was on 

 her way back to England. 



We can now make similar comparisons as regards the South 

 Atlantic. In 1876 the Challenger took a number of stations 

 in about the same region as was investigated by the Fram. The 

 Challenger's Station 339 at the end of March, 1876, lies near the 



