PHYSICAL OCEANOGBAPHY OF THE GULF OF MAINE 
783 
the southern side of the Bay 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. Recurrence 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 increasing 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 
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 mille (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 
