528 



BULLETIN OF THE BUBEAU OF FISHERIES 



fully in the chapter on the circulation of the gulf (p. 921). Its existence and its effect 



on the bottom temperatures of the guK are among the most interesting facts brought 



out by the survey. 



A counter expansion of water colder than 6° and fresher than 33 per mille, out 



of the guK and around the southeast face of Georges Bank, also adds interest to the 

 100-meter chart. 



In February and March, 1920, the gulf proved warmer at 200 meters than at 

 100. Probably the 200-meter level is never as cold as 4° ; in fact, most of the readings 

 were fractionally higher than 5°, being from 4.29° in the Fundy Deep to 6.85° in the 



Temperature, Centigrade 



,o 2° 3° 4° 5° 6° T 8° 9° 10° 11° 12° 13° 14° 15° 16° 17° 18° 19° 

 Meter 



10 



20 



30 



40 



50 



60 



70 



80 



90 



100 



110 



120 



130 



140 



150 



160 



170 



180 



Fig. 6.— Vertical distribution of temperature in the deep trough between Jeflreys Ledge and the coast, March 

 to August. A, March 5, 1920 (station 20061); B, March 6, 1921 (station 10509); C, May 14, 1914 (station 

 10278); D, August 22, 1914 (station 10252). The broken curve is for August 9 of the cold summer of 1923 



Eastern Channel, with 5.2° to 5.6° at most of the stations. The 200-meter temper- 

 ature at the three February-March stations outside the edge of the continent were 

 as follows: 12.39° off the southwest face of Georges Bank on February 22 (station 

 20044), 5.9° off its southeast slope on March 12 (station 20069), and 7.89° off Shel- 

 bume. Nova Scotia, on March 19 (station 20077). 



