BIGELOW: EXPLORATIONS OF THE COAST WATERS. 



205 



July 28, A.M. 



Time 



Duration, seconds 



Direction 



Vel. cm. per sec. 



Vel. knot per hour 



Current at 30 fathoms. Station 10231. 

 July 27, P.M. 



A strong southwesterly surface drift was also noticed on July 29, 

 when the current set the ship about 15 miles to the southwest, during 

 the occupation of Station 10235 and the run thence to the coast, with 

 a brisk east wind and rough sea. 



No current measurements were taken in 1915. But both in May 

 and in June of that year we encountered a very strong surface current 

 on German Bank, in the former instance toward the west, in the 

 latter toward the north and northwest, which cannot be explained 

 by the tides; and though these could not be measured accurately, the 

 May current had a velocity of at least one knot. 



Seasonal Changes in Temperature and Salinity. 



We already have a fairly complete knowledge of the regular seasonal 

 changes which take place in the shallow waters off the western shore 

 of the Gulf (1914a, 1914b, 1915). And the records for 1915 add a 

 general view of the summer cycle for the Gulf as a whole, with much 

 needed light on the seasonal fluctuations of the Cabot Current. 



The seasonal variations may first be outlined for the more in- 

 structive and better known localities individually, a composite picture 

 of the annual cvcle of the Gulf as a whole being attempted below 

 (p. 213). 



