662 



BULLETIN OF THE BUEEAtT OF FISHERIES 



During the winter of 1919-20 the water of Gloucester Harbor (fig. 29) chilled 

 to about - 1.5° and was colder than 0° from about January 12 to March 20; Booth- 

 bay Harbor (fig. 30) chilled nearly to — 2° and was below 0° from January 5 to March 

 5; Lubec Narrows (fig.31), where tidal mixture with the water outside is more active, 

 chilled to about the same temperature as Gloucester and was colder than zero 

 for a slightly longer period — January 5 to March 20. In such situations, then, the 

 strength of the tides and the frequency with which the water is renewed fro m out- 

 side govern the minimum to which the temperature drops in winter more than the 

 latitude does. 



THERMAL SUMMARIES 



Summaries of the thermal cyles for the following representative localities are 

 given: (1) Mouth of Massachusetts Bay, off Gloucester; (2) the Fundy Deep, 

 between Grand Manan and Nova Scotia; (3) near Mount Desert Island; and (4) 

 the western side of the basin of the gulf in the offing of Cape Ann. 



1. MOUTH OF MASSACHUSETTS BAY, OFF GLOUCESTER 



Temperatures at various dates, to 0.1°, some by direct observation and others by interpolation 



