Ill 



PETTERSSON— INTRODUCTO RY 



Bathymétrie chart 



Fig. I 



main branch of the Atlantic Stream in the Norwegian Sea, takes, however, a 

 northerly direction along the Norwegian coastal bank, its water-masses being 

 distributed on the surface over the great depths of this sea and sending thence 

 various branches, both to the N. W., N. and N. K. These jjortions of the warm 

 Atlantic Stream only remain so long on the surface, however, until the density of 

 the water has on cooling become greater than that of the surrounding water. The 

 Atlantic water is then covered by water of a different origin and forms intermediate 



