956 
BULLETIN OF THE BUREAU OF FISHERIES 
overlying Browns Bank, the Eastern Channel, and the water off the mouth of the 
latter; the other situated over the northeastern part of the basin; the two separated 
by a slight potential elevation of the surface. Contrasting with these “lows,” which 
Fig. 203.— Dynamic gradient at the surface, July to August, 1914, referred to a base station in the Eastern Channel. The 
curves are for every dynamic centimeter. The picture south and east of the heavy dividing line is for July; north 
and west of it for August 
are obviously the vortices of anticlockwise circulation, is the high in the offing of 
Massachusetts Bay. A slight gradient, west to east, is also shown from the north- 
ern low toward Nova Scotia in August; a steeper gradient of the same order north- 
ward toward the coast of Maine. There is every reason to suppose that the water 
