358 E. M. KINDLE 
currents is easterly. This was evidently the case off the mouth of 
the Buffalo when I passed it early in July. The canoe entered 
muddy water some distance east of the mouth of the stream, but 
entered clear water immediately west of the west bank of the river, 
although a breeze from the northeast was blowing at the time. At 
a later date Mr. Cameron made similar observations at the mouth 
of the Buffalo. The muddy water of the Slave ceases to be noticeable 
in the lake ro or 12 miles west of the western side of the delta. 
There is probably no lake in North America which receives any- 
thing like the amount of driftwood which is poured into Great 
Slave Lake, chiefly through the Slave River (Fig. 12). The shores 
Fic. 12.—Drift timber on the shore of Great Slave Lake 
are nearly everywhere lined with enormous quantities of logs, many 
of which came from a thousand miles or more up the Peace. Large 
quantities of this driftwood must eventually become water-logged 
and sink. Practically none of it leaves the lake by the Mackenzie. 
At some localities the drift timber is intimately mixed with the 
shingle of the beaches (Fig. 13). 
In Lake Athabasca sedimentation appears to be even more 
localized than in Great Slave Lake. The maximum length of Lake 
Athabasca, which nearly equals that of Lake Ontario, lies in an 
east and west direction. ‘The great bulk of the sediment which the 
lake receives is poured into the western end by the Athabasca and 
Peace rivers. It is discharged from this end by way of Little 
Lake and Slave River. The relationship of the Peace River dis- 
charge to Lake Athabasca is peculiar and variable. Three or four 
