148 Scientific Intelligence. 
Seigniory of Petite Nation, on the Ottawa, in a limestone of the 
Grenville band of Sir W. E. 
: eriments on Schistosity in rocks, and on the deforma- 
tions of fossils attending its production ; by M. Dausrhe (C. R., 
Ixxxii, March 27 and April 10, 1876.)—The production of folia- 
tion in rocks is here discussed at length and illustrated by facts 
rom experiments; and the results are made by Daubrée to 
include all examples of a schistose structure. His experiments 
were made by the hydraulic press used by M. Tresca in similar 
researches, and under the advice of this physicist. Clay contain- 
ct 
having taken a position parallel to the surface. Thesa 
the scale of mica the more perfect the parallelism. These clays 
thus made foliaceous called to mind, strongly, M. Daubrée ob- 
serves, the foliaceous character of mica schist and gneiss. By the 
same process, the compression of fossils was illustrated and also 
the occasional subdivision of one into a series of separated parts. 
A belemnite was too firm to answer for the ex eriment; but 4 
piece of chalk cut into the form of a belemnite, gave precisely the 
acture and separation of parts so often seen. 
Daubrée states that in the production of the foliated or schistose 
structure, there is a sliding of the parts unequally in the direction 
rapid. 
e experiments Daubrée draws the wide conclusion that 
i ist, as well as that 
e 
for example, movement under pressure of the protogine mate 
when pressed out in a plastic condition was the cause of all the 
schistosity the rock presents. 
. vere gneiss, mica schist, quartzyte, limestone occur in alter 
nating beds, : 
planes of junction, they must of course be regarded as successive 
structure of gneiss or mica schist was occasioned i Bias a 
not, is to be ascertained by a direct study of the rocks in place. 
