214 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. . 
Bay of Fundy (Fig. 54), shows that the upper layers at Station 10096 — 
are salter than the water at corresponding depths further off shore. — 
And this is true whether Station 10092 or Station 10093 be taken as 
the outer end of the profile, though the difference is slightly greater 
in the case of the latter. The uniform water between thirty and sixty 
fathoms at Station 10096 is slightly salter (33.4%o) than the mean 
(33.27%) of the corresponding column of water at Station 10093. 
Station 10096 was likewise considerably salter as a whole than the 
water over the slope of German Bank (Station 10094), especially in 
the mid-depths; and though the latter was the salter of the two on 
the surface this does not invalidate the general statement, because its 
high surface salinity was due to local vertical mixing by tidal currents — 
(p. 204). In short, the upper thirty fathoms of water was salter off the 
mouth of the Bay of Fundy (Station 10096) than on the coast bank 
to the south, the eastern basin, or for that matter, anywhere else in 
the Gulf; probably due to an updraught from the mid-depths off shore. 
And the profile is further interesting because the spreading of the — 
curves for 33.4% and 33.5% o over the coast slope at 50-80 fathoms 
suggests that vertical mixing, which in the Gulf is synonymous with 
tidal currents, was active on the bottom at Station 10096, though 
not on the surface. 
DENSITY, AT THE TEMPERATURE IN SITU, CapPE Cop TO CHESAPEAKE 
Bay. 
The chart of density on the surface south of Cape Cod (Fig. 55), © 
for the first half of July, is less significant in detail than the chart of — 
surface salinity, because surface density was constantly falling, with 
the seasonal rise in surface temperature (p. 156). The off shore water 
was as a whole heaviest, the coast water lightest. But on our voyage 
south we encountered a secondary area of low density over the central 
- part of the continental slope off New Jersey (Station 10070), as out- 
lined by the curve for 1.0220, with heavier water (1.0227) between it 
and the coast, a phenomenon caused by the rapid warming of compara- 
tively fresh surface water (p. 187) by warm southerly winds from the 
Gulf Stream, which prevailed at that time. And by the end of July 
the rise of surface temperature (p. 156) caused even lower densities 
next the coast (Station 10080, density 1.0215; Station 10081, density 
1.02145). The density was lowest (1.0184) at the mouth of Chesa- 
peake Bay, highest outside the continental shelf (Station 10071); 
