12 MARION AND GENERAL GREENE EXPEDITIONS 



It can be seen from the foregoing history that the waters of 

 the northwestern North Atlantic can be divided with reference to 

 the degree of their exploration. A list of the research vessels with 

 the dates during which they have made physical oceanographic sur- 

 veys in the areas shown on figures 2 is as follows : 



Ai. Michael Sars, 1910; Scotia, 1913; United States Coast Guard (Inter- 

 national Ice Patrol), 1914-35; French hospital ship, 1929-34; Cape Agiihlas, 

 1931-33; Canadian Fisheries, 1914^15; Caniegie, 1928; Challenger, 1932; At- 

 lantis 1935 



Aj. '/Sfo^ff, 1883; Fylla, 1884-89; Ingolf, 1895, 1934; Tjalfe, 1908-9; Michael 

 Sars, 1924; Dana, 1925; Godthaab, 1928; Marion, 1928; General Greene, 1931, 

 1933, 1934; French hospital ship, 1929-30-31-34. 



A,. Sofia, 1883 ; Ingolf, 1895 ; Tjalfe, 1908-9 ; Dana, 1925 ; Meteor, 1929-33-35 ; 

 Carnegie, 1928; Polaris, 1932. 



Bi. Ingolf, 1895; Chance, 1926; Scotia, 1913; Godthaab, 1928; Carnegie, 1928; 

 French hospital ship, 1929-31-34; Marion, 1928; General Greene, 1931-33-34-35; 

 Challenger, 1932. 



Bj. Meteor, 1935; General Greene, 1935. 



Bs. Canadian Fisheries, 1914-15; United States Coast Guard (International 

 Ice Patrol), 1921-23. 



Bi. Sofia, 1883; Michael Sars, 1924; Gadthaab, 1928; Marion, 1928. 



Bs. Atlantis, 1931 ; Michael Sars, 1910 ; Challenger, 1932 ; Scotia, 1913. 



Ci. Atlantis, 1932. 



C2. Atlantis, 1931, 1935; Challenger, 1932. 



D. Challenger, 1932. 



It should be added there is no sector from which there are today 

 sufficient subsurface observations to give accurately the prevailing 

 annual cycle. 



