582 



BULLETIN OF THE BUREAU OP FISHERIES 



in the eastern side in June, just as it is in May (p. 556, fig. 27), and warmest in the 

 inner part of Massachusetts Bay. 



In June the surface of the gulf is coldest over the shallows west of Nova Scotia, 

 with rather a sudden transition from surface temperatures of 8° to 9° and higher in 

 the eastern side of the basin to readings lower than 7° to 8° next the land. The 

 comparatively warm core (8° to 9°) extending up the deep trough of the Bay of 

 Fundy, outlined by the curve for 8° on this surface chart, also deserves mention, as 

 does the slightly cooler zone (7° to 8°) extending westward along the coast of Maine 

 across the mouth of Penobscot Bay. 



In the offshore side of the picture, Dickson's (1901) data for the years 1896 and 

 1897 locate the isotherm for 15° as following along the continental edge of Georges 

 Bank, with surface water of 20° separated from the edge of the continent by a wedge 

 of cooler water increasing in breadth from west to east. 



FiQ. 42.— Temperature of the eastern side of the gulf at a depth of 40 meters, last half of June, 1915. The Bay of 

 Fundy temperature is according to Mavor (1923); the temperatures along western Nova Scotia are from 

 Dawson (1922) 



The June chart for 40 meters (fig. 42) shows a gradation in temperature across 

 the gulf from west to east of the same sort as appears at the surface (fig. 39). 

 The influence of the Nova Scotian current on temperature at the 40-meter level is 

 graphically illustrated by an expansion of water colder than 3° from the coast off 

 Shelburne, Nova Scotia, out across the western part of Browns Bank, contrasting 

 with higher temperatures (5° to 6°) on German Bank and along western Nova Scotia. 



The most interesting feature of this. 40-meter chart is the sudden transition 

 between the cold water on Browns Bank to the much higher temperature (8.2°) in 

 the Eastern Channel (a horizontal dislocation of 5° in a distance of only about 15 



