252 
BATHYMETRICAL SURVEY OF 
9| inches. About 11.30 a.m. on the 10th the wind rose from the west, 
and by 4 p.m. was blowing a gale, so much so that the greatest difficulty 
was experienced in keeping the boat in position for the 5 p.m. series 
of temperatures. It would thus appear that the easterly winds of the 
previous week had blown the warm surface water into the western 
portion of the loch, and the west wind of the 10th had not yet had 
time to reverse this effect; the fact that the area draining into the 
western basin is nearly double that draining into the other two basins 
would doubtless accentuate this result, since more water would enter 
the western basin than the other basins, and this inflowing water at 
this season of the year would be warmer than the water of the loch. 
The range of temperature from surface to bottom in the eastern basin 
was 7°"3 Fahr., the greatest fall being 5°-2 between 20 and 35 feet; 
in the central basin the range was 5°-3, the greatest fall being 4°*5, 
also between 20 and 35 feet; in the western or main basin the range 
was 9° (representing the extreme range observed throughout the entire 
loch), and the greatest fall was 4°*9 between 35 and 50 feet. 
