526 
BULLETIN OP THE BUBEAU OF FISHEBIES 
TEMPERATURE AT 100 METERS AND DEEPER 
In February and March, 1920, the entire basin of the gulf was warmer than 1.5° 
at 100 meters (fig. 13); all but its northwestern margin was warmer than 2°. The 
most noteworthy features of the chart for this level are the very striking contrast 
between the cold inner waters of the gulf (1° to 3°) and the high temperature (7° to 
13°) outside the edge of the continent, with the clearly outlined tongue of compara- 
tively warm (4° to 6°) water entering via the Eastern Channel (better defined at 
this level than at 40 meters) to extend northward and northwestward along the east- 
ern branch of the trough, which deserves special attention. The influence of this 
warm indraft also is made evident around the northern slope of Georges Bank, west- 
Fig. 4. — Vertical distribution of temperature at the mouth of Massachusetts Bay, March to August. A, March 
1, 1920 (station 20050); B, April 9, 1920 (station 20090); C, May 4, 1920 (station 20120); D, May 16, 1920 
(station 20124); E, July 20, 1912 (station 10002); F, August 22, 1914; G, August 31, 1915 (station 10306) 
ward to the Cape Cod slope, in readings of 3° to 3.6°. With this warm tongue as 
clearly defined by high salinity as it is by temperature, its nature as an actual cur- 
rent flowing into the gulf via the Eastern Channel from outside the continental edge 
is sufficiently established. Seldom, in fact, do the curves for salinity and for tem- 
perature correspond as closely as they do in this case, even to the pooling of the 
warm, saline water off the mouth of the Bay of Fundy. This phenomenon, of which 
we have had frequent evidence in other years and at other seasons, is discussed more 
