808 
BULLETIN OP THE BUREAU OP FISHERIES 
about 0.2 per mille for the preceding six weeks. Apparently this indraft of saline 
water from offshore then slackened, for on February 13 the water (then virtually 
homogeneous, top to bottom) still had this same salinity. It then salted once more 
to 33.04 per mille on the bottom by March 4 (no change at the surface), with a 
slight further increase during the next two weeks to 33 per mille at the surface and 
33.17 per mille on bottom, which proved the maximum for the year, succeeded by 
the vernal freshening already described (p. 723). 
In 1925 the salinity of the deep central part of the bay remained virtually 
unchanged from February 7 12 until March 10, at about 33 per mille, surface to 
bottom. 
In 1921 the bottom of the basin off Cape Ann showed no appreciable alteration 
in salinity from December and January to March, with bottom readings of 33.87 to 
33.99 per mille at all three of these stations (10493, 10503, and 10510) in depths of 
200 to 250 meters; but the bottom water of the bowl at the mouth of Massachusetts 
Bay off Gloucester freshened by about 1 per mille (stations 10489 and 10511, 33.84 
and 32.7 per mille). 
It is doubtful, therefore, whether any appreciable drift inward over the bottom 
of the gulf took place during the winters of 1921 or 1925; and while rising salinity 
gave evidence of some such movement into Massachusetts Bay in the winter of 1913, 
the alteration from month to month was so small as to prove it small in volume as 
well as intermittent in character. In the Bay of Fundy, again, according to Mavor 
(1923, p. 375), salinity decreased slightly between January 3 and February 28 in 
1917. 13 In short, such evidence as is available suggests that the winter sees a 
decided slackening of the drift of slope water inward through the Eastern Channel. 
SUMMARIES OF SALINITY FOR REPRESENTATIVE LOCALITIES 
Summaries of the annual cycle follow for localities where the greatest number of 
observations have been taken. Unfortunately, none of these stations in the open 
gulf afford a complete year’s cycle at intervals close enough, either in time or in depth, 
to be more than preliminary, but at the least they will serve to illustrate the major 
changes to be expected from season to season and from the surface downward. 
BAY OF FUNDY 
Mavor’s (1923) records of salinity on 18 occasions, covering the interval from 
August 25, 1916, to May 10, 1918, at a station near the mouth of the Bay of 
Fundy, between Grand Manan and Nova Scotia, are especially instructive in this 
connection. The outstanding event in the annual cycle of salinity here is the sudden 
freshening of the surface that takes place in spring (fig. 165), occasioned by the out- 
pouring of fresh water from the rivers emptying into the bay — chiefly from the 
St. John. This occurred between the 10th of April and the 10th of May in both of 
these years (probably the usual date). As described above (p. 743), the surface then 
salts again as the thin stratum so affected mixes with the salter water from below, 
12 No salinities were recorded prior to that date during that winter. 
ls Prince station 3, Jan. 3, salinity 32.6 per mille at the surface, 33.24 per mille at 100 meters, and 33.33 per mille at 175 meters, 
while on Feb. 28 the values at these same depths were 32.66, 32.97, and 33.01 per mille. 
