224 Scientific Intelligence. 
Moreover, several of the lignites nearly equal, and that of Cafion 
City surpasses, the “ block coal” of J 
are therefore led to —. that high metallurgical temperatures 
can be obtained from the best lignites of the Rocky Mountains, 
room to doubt.—Hngineering and Mining Journal, May 27, 1873. 
2. The Mineral Region of Lake Superior.—At the meeting of the 
Montreal Natural History Society, held on Monday evening, 
have shown Huronian rocks occur, to a much larger extent 
than was formerly supposed, as bands alternating with Laurentian 
beds on both the north and south shores of the lake. 
Upper Copper-bearing series of Lake Superior. Recent researches 
that 
arious isolated patches of granite and syenite, some a few 
_ and others many miles in extent, but always connected wiht 
uronian rocks, were pointed ont on the map. In these masses 
= is no stratification. - 
n the Nipigon Basin, the Upper Copper-bearing rocks of Lake 
Superior attain their maximum development in Coxiadian Terrl- 
