BIGELOAV: EXPLORATIONS OF THE COAST WATERS. 



195 



a value actually below that of the bottom water of the southeastern 

 part of the Gulf of Maine (p. 183). 



Finally, the salinity profile from Marthas Vineyard to the conti- 

 nental shelf (Fig. 32) deserves brief mention. Along this line the 

 general and characteristic increase in salinity from the land out across 

 the shelf, reappears. And the peculiar conditions over the 60 meter 

 contour (Station 10259), where the mid-depth was fresher than either 



Fig. 33. — Salinity at 40 meters, July-August, 1914. 



surface or bottom, suggest that the fresh, cool land water was moving 

 seaward at about the 40 meter-level, while the fact that there was 

 little further rise in salinity in the upper 40 meters for a distance of 

 30 miles south of this point, is evidence of the mixing of land and ocean 

 waters. 



Salinity at the 40, 100, and 200 Meter-levels. — At 40 meters (Fig. 33), 

 the fresh areas, in the western half of the Gulf of Maine and again off 



