788 



BULLETIN OP THE BUKEAU OF FISHERIES 



It seems, however, that these changes involve the Bay of Fundy to only a small 

 degree at 100 meters or deeper, for in 1917 the saUnity at that level changed from 

 32.4 per mille on July 4 to about 33 per mille on September 3 at a station off Grand 

 Manan (Mavor, 1923, p. 375). Values differing little from this are evidently to 

 be expected in the bay at this depth at the end of most summers, witness Craigie's 

 (1916a) records of 33.3 to 32.4 per mille in 1914^ and Mavor's (1923) of 32.6 to 33 

 per mille in 1919. However, sufficient water of high salinity flows into the bottom 

 of the bay in late summer to maintain a more or less constant (though slight) differ- 

 ential between lower values along its northern side and higher values in its trough, 

 with the water along its Nova Scotian slope intermediate in sahnity at depths 

 greater than 100 meters instead of most saUne, as it is at the 40-meter level (p. 783). 



Meter 0, JPSS- 



26lf 



Fig. 151. — Salinity profile running from the eastern part of Georges Bank (stations 10223 and 10223) across the Eastern 

 Channel (station 10227), Browns Banlr (station 10228), and the Northern Channel (station 10229), to the offing of 

 Gape Sable (station 10230), for July 23 to 25, 1914 



PROFILES 



The relationship that the slope water of high salinity in the Eastern Channel 

 bears to the shallows on either hand, and especially to the overflow over Browns Bank, 

 is most graphically illustrated on the July profile (fig. 151), as is the fact that the 

 eastern edge of Browns was its extreme boundary in that direction (and always has 

 been in our experience) , where it gives place by abrupt transition to much less saline 

 water in the Northern Channel, and so in toward the land near Cape Sable. The 

 profile also corroborates the evidence of the charts to the effect that this water of 

 high sahnity was not overflowing at all on Georges Bank at the time. In fact, it is 

 doubtful if it does so at any season, for we have found no evidence of such an event, 

 either in spring or in summer. 



' Calculated from Craigie's hydrometer readings. 



