764 
BULLETIN OP THE BUREAU OF FISHERIES 
The exact date when this side of the basin is least saline varies from year to 
year, likewise the minimum value to which the salinity of the surface falls there, our 
experience up to date suggesting 31.5 to 32.2 per mille as usual at its lowest. In the 
same way the freshening recorded by Mavor (1923) in the Bay of Fundy early in 
the summer of 1917 may reflect the transference of the water of low salinity from the 
Nova Scotian current northward along the eastern side of the gulf, following the 
route of many of our drift bottles (p. 895). 
Apart from this question, the most interesting aspect of the late summer data 
for the inner parts of the gulf is the comparative uniformity prevailing at the surface 
all along the coastal belt from Massachusetts Bay to Grand Manan in 1912 and 1915 
(31 to 31.9 per mille). It is probable that the isohaline for 32 per mille usually 
crosses outside the mouth of the Bay of Fundy in July, because Vachon (1918) and 
Mavor (1923) record surface salinities ranging from 30.36 to 31.48 per mille at 
various localities in Passamaquoddy Bay and off Grand Manan for that month in 
1916; 30.61 per mille at Prince station 3, east of Grand Manan, on July 4, 1917; 
rising to 31.22 per mille there on July 31. 95 
A considerable body of data has been gathered in the open gulf for the last half 
of July and for the month of August in the years 1912, 1913, 1914, 1915, and 1922, 
which, with the determinations for the Bay of Fundy for the summers of 1914, 1917, 
and 1919 (Craigie, 1916b; Vachon, 1918; and Mavor, 1923) afford a picture of 
the normal midsummer state of the surface of the gulf, with some indication of the 
annual fluctuations to which it is subject. 
For salinity, as for temperature, the period, July to August, is the most nearly 
static part of the jrnar in the open gulf, a statement supported by the following 
surface readings at pairs of stations at proximate localities but taken several weeks 
apart. 
Locality 
Date 
Station 
Salinity 
July 12,1912 
Aug. 31, 1912 
July 8, 1913 
Aug. 9, 1913 
July 19,1914 
Aug. 23, 1914 
July 25,1914 
Aug. 11, 1914 
“July 4,1917 
“July 31, 1917 
July 19,1915 
Aug. 18, 1915 
Aug. 2, 1912 
Aug. 21, 1912 
July 22,1912 
Aug. 24, 1912 
June 19, 1915 
Sept. 1,1915 
June 26, 1915 
10005 
Per mille 
31. 67 
31. 67 
31.90 
Do 
10046 
10057 
Do 
10087 
32. 09 
10214 
31.80 
31.80 
31. 47 
31. 67 
Do * _ 
10256 
10230 
Do .1 
10243 
30. 61 
31. 22 
Do 1 - 
10302 
10305 
31. 83 
31. 94 
Do - — — 
10021 
10038 
32. 43 
32. 32 
Do 
10012b 
31. 92 
Do.. __ - 
10041 
32. 07 
10288 
32. 41 
Do — - - 
10309 
32. 47 
10299 
32. 50 
Do - - — 
Aug. 31, 1915 
July 9, 1913 
k Aug. 8, 1913 
10307 
32. 47 
10060 
32. 63 
32. 77 
Do I - - 
« Mavor, 1923. b Captain McFarland. 
91 Surface densities, determined from hydrometer readings in the Bay of Fundy region, also indicate salinities ranging from 
30.7 per mille to 32.7 per mille (Copeland, 1912; Craigie and Chase, 1918). 
