EXPLORATIONS, WESTERN ATLANTIC, STEAMER BACHE, 1914. 53 
the ocean density at any given latitude is at least no higher in 
summer than in winter; probably lower, because of solar warming, 
there being no reason to expect any great change in salinity out- 
side the zone influenced by the coast. If this be true, there is the 
same dynamic tendency for the mixed water at the 50-150 meter 
level, over the slope off Chesapeake Bay, to sink in summer as in 
Stations 
POU ye ties Batata 45 46 
ae : 
200 oo 
CMLL 
Zz 
“7. 
4 
oy 
300 
400 
5 
Fic. Rane profile across the continental shelf off Chesapeake Bay, January, 1916 (Roosevelt stations 
8442, 8443, 8444, 8445, 8446). 
winter, because the densities are practically the same there for the 
two seasons (Bache station 10158; Grampus station 10176, Bigelow, 
1915, p. 345) except on the immediate surface, where the water was so 
light in summer that it must have been floating out over the ocean 
water offshore (Bigelow, 1915). And summer densities were almost 
precisely the same, at the same relative position, off Delaware Bay 
(Bigelow, 1915, station 10171) as off Chesapeake Bay, in 1913 (fig. 53). 
87497°—17 36 
