584 
BULLETIN OP THE BUREAU OF FISHERIES 
on this cruise, the presence of 6°-water there on May 4 (p. 566) at depths greater 
than 225 to 230 meters, and again on August 31 of the same year (station 10307), 
makes it almost certain that this was also the case in June. 
The relationship which this warm bottom stratum bears to the cooler water above 
it and to the indraft from outside the edge of the continent, is made more graphic by 
the accompanying profile, running from the Eastern Channel westward and inward 
along the basin (fig. 44). 20 Obstructed on the north by the topography of the sea 
floor, this warm bottom water reaches the western part of the basin off Cape Ann 
via the southern branch of the trough, a route that entails its rising over the inter- 
vening ridge to within 190 to 200 meters of the surface. 
Fig. 43— Temperature at a depth of 100 meters, last half of June, 1915. (The Bay of Fundy is according to Mavor, 1923.) 
It is probable that overflows of this sort are intermittent — frequent enough, how- 
ever, to maintain the bottom temperature of the western bowl fractionally above 6° 
for most of the year. The greater thickness of the warm bottom stratum in the 
southeastern side of the basin (into which the Eastern Channel opens) than elsewhere 
in the gulf corresponds to the proximity of the source of supply; and it is not 
unlikely that bottom temperatures of 7° or higher would have been found there at 
the end of June had readings been taken in depths greater than 275 to 300 meters. 
In horizontal plan the bottom water of 6° takes the form of a Y, following the 
outlines of the trough of the gulf; its approximate outlines for May and June, 1915, 
are shown in the accompanying chart (fig. 45). 
Jo The deepest readings in the western side of the basin are borrowed from the May station (10267). 
