Proceedings of Royal Society of Canada. 168 
formability, with the variations and exceptions caused by 
fracture, and subsequent movements. The district is much 
interrupted by masses of granite, which apparently do not 
affect the strata, except locally by metamorphism; and the 
auriferous veins, so far as the writer’s experience goes, are 
not modified in value by their proximity. The ‘pay 
streaks’ or zones of rich ore are described at some length, 
and compared with those found in fissure or cross-country 
veins. In referring to the source of the gold in the veins, 
and especially in their richer portions, the facts are dwelt 
upon, that the proximity of the granitic masses was not the 
source of enrichment, nor did the veins, owing to their con- 
formability to the strata and their limitation to the sides of 
the anticlinal folds, find access to underlying and possibly 
auriferous strata. The fact of the almost invariable pres- 
ence of gold in the slate bands would lead to the belief that 
the gold has been concentrated locally from them, and that 
the pay streaks merely represent the proximity of the 
veins to a spot in the original strata, in which the gold had 
been deposited to an unusual extent. This view would 
necessitate the careful study and comparison of the pay 
streaks of the various localities before the question of 
deeper or ‘second’ pay streaks could be practically tested.” 
The Origin of some Geographical Features in Canada. 
By Dr. Ropprr BE. 
The author first referred to the causes which had pro- 
duced the basins of the great lakes of the Dominion. That 
of Lake Superior was said to be partly volcanic in its ori- 
gin; and the immense basin of Hudson Bay had some 
points in common with it. These basins had been greatly 
enlarged by the subsequent decay and glacial erosion of the 
rocks on all sides. 
Lake Ontario, Georgian Bay, Lakes Winnipeg, Atha- 
basca, Great Slave and other large lakes of Baffin Land, 
occupied geographical positions resembling one another, 
