PHYSICAL OCEANOGKAPHY OF THE GULF OF MAINE 



783 



the southern side of the Baj^ of Fundy along its Nova Scotian side, with a regular 

 decrease in salinity from south to north across the bay to about 32.5 per mille near 

 Campobello Island. Eecurrence of a regional distribution of this same sort in the 

 bay in August, 1916 (Vachon, 1918) and 1919 (Mavor, 1923), proves it character- 

 istic of the 40-meter level there at the end of the summer, though the actual values 

 were somewhat lower in those two years than in 1914. 



Corresponding to the contraction of the area of the gulf with increasLag depth, 

 this salt tongue gives place to a gradation from low salinity to high across the basin 

 from west to east at deeper levels, as illustrated by the 100-meter chart for July and 

 August, 1914 (fig. 147), on which the successive isohalines (33 and 33.5 per mille) 

 outline the same eddying movement of the saltest water westward, past the offing 



Fig. 146.— Salinity at a depth of 40 meters, August 5 to 20, 1913 



of Penobscot Bay, as at 40 meters (p. 781). Some west-east gradation of this sort 

 has been recorded on each of our August cruises at the 100-meter level; but the 

 actual difference in salinity between the highest values in the eastern side of the gulf 

 and the lowest in the western side was much wider in 1914 than in 1913 when the 

 regional range was only from about 33.1 to about 33.5 per mille at 100 meters, with 

 the whole west-central part of the basin close to uniform, regionally, at 33.1 to 33.3 

 per mUle (fig. 148). 



The gradual absorption of the indraft from the Eastern Channel into the gen- 

 eral complex of the gulf is more clearly illustrated on the 100-meter chart for 1914 

 (fig. 147) than at shoaler lines by the successive decrease in salinity, passing inward 



