PHYSICAL OCEANOGRAPHY OF THE GULF OF MAINE 



753 



tends to equalize the regional inequalities in the mid levels of the gulf (fig. 127) as 

 the spring draws to a close. Thus, the extreme range of salinity in the gulf was 

 little more than half as wide at 100 meters in May, whether of 1915 or of 1920 

 (about 0.7 per mille, fig. 127), than in April or in March of 1920 (respectively, 1.1 



40' 



3± 



40- 



Fig. 127. 



-Salinity at a depth of 100 meters, May 4 to 14, 1915 (plain figures), combined witii May 4 to 17, 1920 (underlined 

 figures). Tlie encircled figure in the Bay of Fundy is for May 4, 1917, from Mavor (1923) 



and 1.3 per mille, figs. 94 and 116). At 175 meters (chosen as representative of the 

 deep water of the gulf because this particular contour best outlines the trough of its 

 basin) the extreme range of salinity was only 0.5 per mille (32.94 to 33.46 per mUle) 



