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 
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Fie. 5.— Temperature sections on the continental shelf 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 
iad cooled to 71°-72°; immediately off Cape May to 74° (Fig. 2). 
Jn the other hand, the surface south of Nantucket Shoals was several 
egrees warmer than it was in July, the temperature having risen from 
