178 



bulletin: museum of comparative zoology. 



The profile off Marthas Vineyard is sufficiently illustrated by 

 Fig. 14; the only feature deserving emphasis being the cool water 

 (9-10°) on the bottom between the 40 and 90 meter contours, and 

 the fact that this is separated from the cold water of the abyss by a 



warmer zone. 



Stations 



Met 



Fig. 12. — Temperature profile crossing the continental shelf obUquely off Halifax 

 (Station 10236 - Station 10233) July 29-August 2, 1914. 



Temperature at the Ifi, 100, and 200 Meter-levels. — The surface 

 temperatures of our waters in summer are chiefly the product of 

 solar warming, and local vertical circulation. But the penetration 

 of solar heat being very slow, except close to the surface, tempera- 

 tures at, and below 40 meters may be expected to throw more light 

 on the origin and movements of the waters concerned. 



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