BIGELOW: COAST WATER EXPLORATION OF 1913. 



209 



salinity of the water between five and twenty fathoms was sHghtly 

 lower than at Stations 10092 and 10094, on either side of it. 



Successive profiles from near shore toward the centre of the Gulf, 

 at right angles to the last, show that the water was fresher along the 

 western coast than off shore. In the profile (Fig. 49), from Cape 

 Porpoise, across the northern end of Jeffrey's Ledge, to Station 10090, 

 the salinity curves all dip toward the land; but in the eastern half 

 of the profile (Stations 10089 to Station 10090), they are practically 



Fig. 50. — Salinity profile from Station 10102, off the mouth of Penobscot 

 g; Bay, across Jeffrey's Bank (Station 10091) to the centre of the Gulf of 

 Maine (Station 10090). 



horizontal, i. e., the salinity in the upper fifty fathoms was uniform 

 horizontally; though below that depth the off shore water (Station 

 10090) was "slightly saltest. The fact that the salinity was precisely 

 the same (33.4-33. 5%o) on the bottom in the sink where Station 10089 

 was located, as at seventy fathoms in the basin to the east of it, shows 

 that its rim, which rises to a general level of about seventy-five fathoms, 

 and is crowned by the much shallower Cashes Ledge, is an effective 



