536 
BULLETIN OF THE BUREAU OF FISHERIES 
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the simpler explanation that 
temperatures slightly higher 
at the surface than a few 
meters down merely reflect 
the first stage in the vernal 
warming by the sun, which 
proceeds throughout the 
spring months. Probably 
the upper 10 meters would 
have been found homogen- 
eous in temperature in the 
coastal zone, or the surface 
slightly the coldest level 
then, had the profile been 
run two weeks earlier in 
the season. 
The increase of tem- 
perature from the shore 
seaward is again illustrated 
on the corresponding pro- 
file of the eastern side of 
the gulf (fig. 16). In this 
case, however, the courses 
of the isotherms are com- 
plicated by the fact that 
this particular profile cuts 
the westward extension of 
the warm core that enters 
the gulf via the Eastern 
Channel (pp. 526 and 529). 
Consequently, the profile 
shows the curves for 2, 3, 
4, and 5 degrees, rising con- 
siderably nearer to the sur- 
face over the northern 
slope of the basin (station 
20055) than closer inshore, 
on the one hand (station 
20056), or in the deeper 
water of the basin, on the 
other (station 20054), in- 
denting the cold (1° to 2°) 
surface layer from belo . 
Readings taken at a 
depth of 40 to 50 meters 
