658 
BULLETIN OF THE BUREAU OF FISHERIES 
state, with two distinct cold centers — the one along shore between Boston Harbor 
and Plymouth ( — 0.5° to 0°), the other in the southeastern part of Cape Cod Bay. 
These very low temperatures in the southeastern part of Cape Cod Bay and along 
the Marshfield-Plymouth shore (<0°) are colder than any previously recorded for 
the open waters of the Gulf of Maine. However, judging from the fact that the mean 
temperature of the air had been close to normal during the preceding month, and 
the snowfall unusually light, these parts of the bay may be expected to chill to as low 
a figure as this during most winters. 
Probably the northern side of the bay is never as cold as its southern part is in 
February, for on February 7, 1925, the temperature was 1.67° only a mile out from 
the mouth of Gloucester Harbor, though lower ( — 0.56°) within the latter; and 
Fig. 83. — Temperature profile running from the Marshfield shore out into Massachusetts Bay, January 6 and 7, 2925 ( Fish 
Hawk stations 2 and 15) 
readings of 2.83° on the surface and 3.11° at 82 meters 7 miles off Gloucester on 
February 13, 1913 (station 10053), are probably normal for the mouth of the bay at 
this date. 
The mid-level proved colder than either the surface or the bottom in Massachu- 
setts Bay on February 6 and 7, 1925, at 12 out of the 15 stations (fig. 82). At the 
same time the coldest stratum lay at a depth of 30 to 35 meters at the offshore 
line {Fish Hawk cruise 6, stations 19, 18, 2, and 4) but within 10 to 15 meters of the 
surface near the Plymouth-Marshfield shore. 
Profiles running out from the land off Marshfield for January 6 and 7 (fig. 83) 
and for February 6 and 7 (fig. 84) show a very interesting succession, with the 
