basi 
122 Scientific Intelligence. 
il. GEOLOGY. 
Geological Survey of Canada.—Report of Propels for 1858, 
ontiant 1859, 8vo, pp. 263, with 4 Maps and Sections.— In the pr resens 
volume Sir William Logan continues his description of the distribution 
of the rocks of the Laurentian series. These stratified rocks, the oldest — 
as ®fndamenal gneiss. Laurentia is peaaestind to fon a domain second onlf — 
importance to Siluria, embracing, as it does, in Canada, a mass of 
strata omg tdi ual in amount to the wea palzeozoic series in’ its 
greates 
tions, ae meiy considerable of which jis 1000 feet in thickness. These 
are associated with .gueiss, emeat with sept and great beds pene 
, are enhanced, a the fact that it is still to a very great extent 
: fa primeval fores he outcrop of the limestones, howeveh, 
is generally marked by ain well watered and with a fertile soil which — 
has invited settlers to some distance from the frontier of the region, and 
and Argenteuil, including fifty miles of the valley of the river a 
from the map of this exploration, which ac accompanies the Report, we may 
get an idea of the complexity of structure in this region. 
alike in dolomites, steatites, argillites and iliitian ‘chlortoia slates, 
rally disseminated in the beds, but ova in veins of quartz and 
spar, and more rarely with specular iron and n ch 
itself is rarely native, generally outa as erubescite, copper g 
copper aceon The famous Acton mine is a deposit ‘bilvein : 
