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bulletin: museum of comparative zoology. 



instructi\e, for the curves o\er the eastern slope of the Gulf reveal 

 an intrusion of water of low salinity, from the east, of which we have 

 found no trace in summer, and which is undoubtedly the result of an 

 influx of the Cabot Current around Cape Sable. But at, and below 

 100 meters, there is no evidence of it, though even at this depth the 

 influence of the spring freshets is apparent in the western side of the 

 Gulf (Fig. 70). As pointed out (p. 213) the water along the coast of 

 Maine, and the Eastern Basin of the Gulf are at their freshest in, or 

 before, May. And by June a slight rise in salinity is apparent over 

 the eastern half of the Gulf at all depths down to 100 meters (Fig. 

 64-66), the expansion of SS^co water to the east and northeast being 



300 



Fig. 69. — Temperature profile across the CJiilf of Maine, from off Cape Ann (Station 

 10266) to German Bank (Station 10271), May 4-7, 1915. 



especially striking (c/. Fig. 63, 66) at that level, though it does not 

 yet reach the northern slope, as is the case in mid-summer (Fig. 34), 

 nor has 34%o water yet intruded beyond the Eastern Channel. The 

 salinity curves off Nova Scotia show that the influence of the Ci\bot 

 Current in the Gulf diminishes from Ma^- to June. On the surface 

 it is entirely obliterated there by that time, though the salinity across 

 the whole breadth of the continental shelf off Shelburne is still below 

 32%o (Fig- 64). But at 40 meters (Fig. 65) the curve for 32.5%o 

 still suggests the presence of Cabot Current water as far west as the 

 Eastern Basin. And off Shelburne (Fig. 74), the low salinities (31- 

 32%o) of the Cabot Current and land water combined, still extend 



