802 



BULLETIN OF THE BUREAU OF FISHERIES 



and 10046), though that of the surface had increased from 31.67 to 31.92 per mille 

 to 32.57 per mille during the interval, is proof that the autumnal progression also 

 reflected an indraft of more saline water over the rim. 



Some salting of the whole column of water is to be expected, therefore, at the 

 mouth of Massachusetts Bay during the late autum, besides the increase at the sur- 

 face that stirring by tidal currents would, of itself, effect at this season. Although 

 this alteration was not continuous in 1912, when salinity was almost precisely the 

 same on December 4 as it had been on November 20 at the station in question, ^ it 



Meter 



to 



20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 



too 



tlO 

 120 

 t30 

 140 

 150 

 160 

 170 



leo 



Fig. 161.— Vertical distribution of salinity in the Bay of Fundy between Orand Manan and Nova Scotia, in various 

 months, from Mayor's table (Mavor, 1923, p. 375, Prince station 3). A, July 31, 1917; B, October 2, 1917; C, December 

 5, 1917; D, January 19, 1918; E, December 2, 1918; F, January 3, 1917 



raised the salinity of the entu-e column (now homogeneous, surface to bottom) to 

 about 32.75 per mille by the 23d of that month. 



Mavor (1923) also records a considerable increase in the salinity of the upper 

 strata of the Bay of Fundy from October 4, 1916, through November, although the 

 bottom water continued virtually unchanged throughout that autumn. The verti- 

 cal distribution for October 4 of that year ^ is especially interesting, the salinity being 

 highest at 50 meters, with less saline water below it as well as above, and with a 

 very abrupt increase near the bottom. A distribution of this sort, decidedly unusual 



•32.66 per mille at the surface and at 46 meters; 32.61 per mille near bottom in 70 meters depth. 



' 10 meters, 31.9 per mille; 60 meters, 32.6 per mille; 75 meters, 32.4 mille; 150 meters, 32.5 per mille; and 175 meters, 33 per 

 mille. 



