54 



teristic correspondence between a salinity minimum and a vertical 

 stability maximum. There is no apparent reason why a lateral 

 mixing along the border between waters of contrasting salinity should 

 be evidenced invariably by the intrusion of a tongue of minimum 

 salinity into the water of higher salinity. This is more often the 

 case in the sections investigated but sections C and D show what 

 may also be regarded as similar evidence of lateral mixing in which a 



FiGVKE 57.— Corresponding vertical sections of salinity in parts per thousand, and vertical stability expressed 

 as depth rate of change of <rt (A <rt/niX10<) in the vicinity of the Grand Banks, 1935 and 1936. 



tongue of maximum salinity intrudes into the water of lower salinity. 

 Section C does not extend far enough toward the Atlantic Current to 

 show fully, the lateral mixing taking place along this section. Sec- 

 tions D, E, and F intersect not onh- the margin of the Atlantic Cur- 

 rent but the Labrador Current as well. In section D, in addition to 

 the vertical stability maximum indicated b}" the broken line and 

 corresponding to a tongue of maximum salinity intruding westward, 

 another less pronounced stability maximum is to be seen near the 

 slope of the Grand Banks which may be related to the depression of 

 the isohalines there. Tliis can be interpreted as a correspondence 

 with a salinity minimum. The distortion produced by the different 



