620 
BULLETIN OF THE BUREAU OF FISHERIES 
eastern side of the picture 
(station 10311), resulting 
from the active tidal stir- 
ring, is characteristic of late 
summer. 35 
The low surface read- 
ing of 9.4° on German Bank 
was unexpected, because the 
whole underlying column 
and the surface water to the 
east as well as to the west 
of the station were slightly 
warmer. Probably this 
local chilling had its source 
in some upwelling from the 
still colder bottom water 
close in to Cape Sable. 
In summers following 
periods when the inflowing 
bottom current has been 
weaker, or at least less regu- 
lar (1913, for instance), cross 
profiles of the gulf bring out 
the cold mid layer even 
more clearly (fig. 63), with 
minimum readings of about 
5.2° in both sides of the 
gulf at depths of 75 to 90 
meters in this particular 
year. But, contrasting 
with this same month of 
1914 and of 1915, the profile 
for 1913 shows only a frac- 
tional warming with in- 
creasing depth, from this 
level downward toward the 
bottom, with no apparent 
banking up of the warmer 
bottom water against the 
eastern slope. 36 
>5 The isotherm for 10° for this region, 
on my earlier representation of this pro- 
file, is incorrect (Bigelow, 1917, fig. 71). 
as Highest value at 175 meters 6.6° off 
Cashes Ledge (station 10090); lowest 5.9° 
in the eastern side of the basin (station 
10093). 
