Specemen of Lake fron Ore. 43 
’ As the land eastward of Brandon rose above the water level, 
the river had of necessity to form a continuation of its 
course to some new outlet for its waters. This new outlet 
was eventually found at Winnipeg, where it joined the Red 
River, which must then have been a new stream, formed 
by the waters of the south, seeking, by reason of the rise of 
the land there, a new exit to the sea to the northward. 
That the Assiniboine had by this time become a small 
stream compared with its former proportions, is shown by 
the contracted banks of this newer part of its course, those 
at Winnipeg and Portage la Prairie being not more than 
from two to three hundred feet apart, and from twelve to 
fifteen feet high. 
‘ 
NOTE ON A SPECIMEN OF LAKE [RON ORE FROM LAG 
LA TORTURE, P. Q. 
By B. J. HARRINGTON. 
Some time ago, through the kindness of Mr. George 
McDougall, of Three Rivers, P. Q., the writer was enabled 
to obtain a specimen of Lake Iron Ore from the bottom of 
Lac la Tortue, where the material is said to occur in con- 
siderable quantity. The Lake is situated about twenty 
miles north of Three Rivers in a region which, according 
to Sir William Logan’s geological map, is occupied or 
underlaid by rocks of Laurentian age. In appearance, the 
ore closely resembles one of the concretionary bog ores 
found in so many parts of the country, and of which 
analyses have frequently been published. A few months 
ago, an analysis of the La Tortue lake ore was made by Mr. 
W. A. Carlyle, B. A. Se., then a student in the laboratory 
of McGill College, and the results are deemed worthy of 
recording, especially as no facts concerning Canadian lake 
ores have hitherto been published. No. I. is Mr. Carlyle’s 
analysis, while No. lI. is one by Svanberg of a Swedish 
lake ore:— 
