156 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Low temperature (55° to 56°), characterized the surface waters very 
generally as Nantucket Shoals were crossed, though with occasional 
readings of 60° or 61°, irregularities associated with the violent tidal 
currents of that region. But when the deeper water to the south was 
reached the temperature rose to 65° and higher. The coldest surface 
water west or southwest of Nantucket was just off New York (62° 
63°) the warmest off the mouth of Chesapeake Bay (79°-80°). And in 
a general way we found a rise of temperature over the continental 
shelf from north to south (Fig. 1). Thus it was 64°-67° between 
Nantucket Shoals and the edge of the continental shelf, rising to 69° 
and 70° abreast of Long Island, 70 miles off shore. Near New York, 
however, it was much colder, as pointed out above; though it rose 
again to 66° and 67° off Barnegat. Off shore on the line from Barnegat 
to the Gulf Stream, the surface temperature rose to 74° at Station 
10071. Off Delaware Bay it was 75°; 76° close in shore off Cape 
Charles, and 78° off the mouth of the Chesapeake. In general, on 
the several lines across the continental shelf, the surface water was — 
slightly warmest at the off shore station, 2. ¢., nearest the Gulf Stream, 
as shown in the following table:— 
Line A. Station 10063 67° Line C. Station 10069 69° 
10062. .64° 10070 1% 
10061: 68° 10071 76° 
Line B. 10067 ~=63° Line D. 10078 78° 
10066 69° 10077 Tt 
10065 69° 10076 76° 
10064") 70° 
but this was reversed off Chesapeake Bay (Line D), where the off shore 
station was 76°, the in shore one 78°. Short though the stay in the 
Chesapeake was, it was long enough for a decided warming of the 
surface water to take place. On July 29, the surface temperature of 
the Bay had risen 2° to 80°, and as we sailed northward, a consider- 
ably greater discrepancy between our two sets of readings was noted. 
Thus when the northerly line approached our previous course, south 
of Cape Henlopen, the temperature had risen from 75° to 78°: off 
Barnegat from 66° to 75°; and off Fire Island light-ship, where the 
lines cross, the surface had warmed 4°, (69° to 73°) during the two 
weeks interval. Since the salinity showed that no shoreward move- 
ment of the surface waters of the Gulf Stream had taken place, this 
rise of surface temperature was no doubt the result of solar warming. 
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