674 



BULLETIN OF THE BUKEAU OP FISHERIES 



the same in 1924 (3.13°, station 10653) as in 1925 (3.97° and 4.04° at Fish Hawk 

 stations 30 and 32). 



Out in the open basin, oflF Cape Ann, the surface warmed from 6.1° on May 4, 

 1915 (station 10267), to 13.6° on June 26 (station 10299), or at about the same rate 



40' 





» ^— — •■ 



Fig. 39.— Surface temperature in mid-June from all available sources. The dotted curves are based on Dixon's (1901) 



tabulation 



as in Massachusetts Bay in 1925. The 40-meter temperature, however, rose by only 

 1.5° during the interval (from about 5.2° to about 6.8°), while virtually no change 

 took place at 90 meters or deeper (fig. 5). It is probable, also, that the seasonal 



