748 



BULLETIN OF THE BUKEATJ OF FISHERIES 



32.4 per nulle, station 10277). It is probable, also, that this generalization applies 

 equally to the eastern coast of Maine, though our data are less satisfactory for this 

 sector. Mayor's (1923) records for the springs of 1917 and 1918 also prove it equally 

 applicable to the central part of the Bay of Fundy, where for a brief period in May 

 and early June river water (chiefly from the St. John) causes a vertical range of 

 salinity as wide as ever obtains anywhere in the open waters of the gulf. 



In the eastern side of the gulf, however, which receives land water in only rela- 

 tively small amount, the whole column continues so thoroughly m-ixed by the tidal 

 currents throughout the spring that our standard station on German Bank (fig. 109) 

 has shown no more difference between the surface and the bottom in May (station 

 10271 and Ice Patrol stations 22 and 38) than in April, on the one hand, or in June 



Meter 



10 

 20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 

 100 



lie 



120 

 130 

 140 



150 



Fig. 123.— Vertical distribution of salinity off Penobscot Bay. A, March 4, 1920 (station 20057); 

 B, April 10, 1920 (station 20097); C, May 12, 1915 (station 102761: D, June 14, 1915 (station 

 10287); E, October 9, 1915 (station 10329) 



or August, on the other, though the actual values were considerably lower for May 

 of the years 1915 and 1919 (31.7 to 32 per mille) than for any other month of record. 

 This also applies to the vicinity of Lurcher Shoal, a few miles farther north (fig. 

 108), where the graph for May nearly parallels those for March, April, and 

 September, though lower in salinity." 



The directions in which the discharges from the large rivers spread out over the 

 surface are betrayed by the vertical distribution of sahnity as well as by the actual 

 values as represented in horizontal projection. Thus, the fact that salmity altered 

 very little in the trough off the Isles of Shoals from March to April, 1920 (stations 

 20061 and 20093), with the values for May 14,, 1915 (station 10278), differing by 

 less than 0.5 per mille from April, 1920, locates the Hue of transition (from the region of 



•1 Thirty-two per mille at the surface to 32.3 per mille on bottom in 90 meters, May 10, 1915, station 10272. 



