9 2 



Temperature Sections Surveyed. 



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

 authors 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. 6o° 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 io° 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 



