BIGELOW: COAST WATER EXPLORATION OF 1913. 



159 



by the tidal currents. When this dangerous channel was left, the 

 surface temperature rose to 63°, the normal figure for the southern 

 half of the Gulf of Maine at this time of year. Late in August, when 

 the Grampus came southward again (p. 154) the temperature was 

 practically unchanged off Block Island and over the shelf south of 



Fig. 5. — Temperature sections on the continental slielf south of New York 

 (Stations 10069, 10070, 10072, 10073) and at the edge of the Gulf Stream 

 in Lat. 38° 56' (Station 10071). 



Marthas Vineyard; but near shore south of New York, the water 

 had cooled to 71°-72°; immediately off Cape May to 74° (Fig. 2). 

 On the other hand, the surface south of Nantucket Shoals was several 

 degrees warmer than it was in July, the temperature having risen from 



