regions, it was impossible to employ a sufficiently deep common 

 decibar plane, so in order to express the dynamic topography of the 

 sea surface it was necessary to follow methods which give dynamic 

 diflferences between adjacent pairs of stations. The figures, there- 

 fore, appearing on Figure 49 are expressed in terms of dynamic 

 millimeters which are reckoned above a zero point located a short 

 distance northeast of Flemish Cap. 



4^ 4% 41 4(, AS 



Fig. 48.— Set IV. The distribution of salinity at the 50-meter level, May 29- June 3, 1927 



Figure 49 is featured by two general areas of high sea surface, one 

 over the Bank and the other out in the deep water to the eastward. 

 We took no observations over Flemish Cap itself, but in all proba- 

 bility they also would have shown the surface of the sea relatively 

 high. On the other hand, a deep and narrow furrow lay stretched 

 along the edge of the Bank between the forty-fourth and forty-fifth 

 parallels, with the lowest point of the sea surface located north of 



