792 



BULLETIN OF THE BUEEAU OF FISHERIES 



In 1922, also, the upper 50 meters was least saline in the northern side of the 

 bay, as might be expected if the general anticlockwise eddy enters it. This is 

 probably the usual state at the end of the summer, also, unless temporarily interrupted 

 by the offshore winds, when temporary upwellings may be responsible for surface 

 salinities higher in the northern side of the bay than in the southern side (so confus- 

 ing the picture), as appears on the July profile for 1916 (fig. 155). 



Our own cruises do not afford summer profiles for the Bay of Fundy; but Mavor 

 (1923) gives several such for August, 1919, cross-cutting the bay at intervals, all of 

 which show the upper strata of water on the whole salter in the southern ( Nova 

 Scotian) than in the northern (New Brunswick) side. This distribution, as Mavor 

 has brought out, corresponds to a tendency for the outpouring discharge of fresh 

 water from the St. John River to spread southwestward along New Brunswick, while 



Meter 



Fig. 155. — Salinity profile crossing Massachusetts Bay from the eastern point, Gloucester to Cape 

 Cod, just inside Stellwagen Bank for, July 19, 1916. The broken curve gives the contour of the 

 bank (stations 10340 to 10342) 



the Salter water (32 to 32.5 per mille) tends to bank up against Nova Scotia, giving 

 a marked obliquity to the isoh alines. In the bottom of the trough of the bay 

 Mavor's profiles show the saltest and coldest water (33 to 33.1 per mille) as a lon- 

 gitudinal ridge, which he explains (Mavor, 1923, p. 364) as due to a rotation of the 

 deeper water around this locality as a center. Concentration of the lowest salinities 

 in the northern side also appears in the densities on profiles of the lower part of the 

 bay for August, 1914 (Craigie, 1916a), proving this the usual summer state. 



The characteristic contrast, below the surface, between the high salinity of the 

 Atlantic basin and the much less saline water of the continental slope and shelf is 

 brought out graphically for the summer months by the profiles (figs. 156 to 15S) 

 for 1914. Whether in July (figs. 156, 157) or in August (fig. 158), the successive 



