The Rocks of Clear Lake near Sudbury. 343 
honours, a stroke of paralysis disabled him from active 
duties, and he grew gradually feebler until his death. 
With him American science loses one of its most honoured 
and distinguished cultivators. His piercing eyes and well- 
- cut features made him a marked figure in any assembly, 
while his courtesy and gentleness, and his unfailing help- 
fulness and serenity, gave him a charm which will endear 
his memory to a wide circle of friends. AgiGa? 
THE Rocks oF CLEAR LAKE NEAR SUDBURY. 
By Pror. CoLtpman, Px.D. ) 
An exceedingly interesting set of rocks from the Sud- 
bury district has been described by Prof. Bonney!' and Prof. 
Williams,’ and it seems worth while to compare with them 
a series of specimens collected last summer by the present 
writer in a part of the region not hitherto worked over. 
The point visited les about 17 miles north of Sudbury in 
the area marked Laurentian on Dr. Bell’s map,? and was 
reached from Chelmsford, a village ten miles west of Sud- 
bury, on the main line of the Canadian Pacific Railway. 
The rocks observed up to the crossing of Vermilion 
River, belong to the series colored on Dr. Bell’s very useful 
map as “dark argillaceous and gritty sandstones with shaly 
bands, possibly lower Cambrian.” Among the specimens’ 
obtained were dark sandstones of the kind described by Dr. 
Bell, having as constituents weathered felspars, mica and 
quartz of the granitic type, showing their origin from 
granite or gneiss. Other ridges were of dark grey clay- 
slates with a marked cleavage crossing the very distinct 
planes of stratification obliquely, and presenting under the 
microscope no distinct minerals except sericite and minute 
prisms of a uniaxial mineral, perhaps rutile. 
1 Quart. Journ. Geol. Soc.. Vol. 44. 
2 Notes on the Microscopical Character of Rocks from the Sudbury Mining 
District, an appendix to Dr. Bell’s report. 
3 Report on the Sudbury Mining District, by Dr. R. Bell, 1891. 
