92 



Temperature Sections Surveyed. 



Thomas Bolster of H.M.S. "Flora," and kindly placed at the 

 author's disposal by Captain Sir G. S. Nares. 



The great surface-current of the Southern Ocean, as it 

 flows from west to east, makes the circuit of the world between 

 the parallels of lat. 60° and 40° S., and is split up by the 

 projecting continents of South America, South Africa, and 

 Australia into several branches, which can be traced flowing- 

 northwards along the western coasts of these continents, and 

 which constitute the cold surface-currents of the South Pacific, 

 the South Atlantic, and the Indian Ocean. The rapid fall of 

 temperature — from 16° C. to 5° C. in the summer, from 10° C. 

 to 5° C. in the winter of the southern hemisphere between the 

 parallels of lat. 40° and lat. 50° S. — shows that the great surface- 

 current of the Southern Ocean forms between these latitudes 



