442 Scientific Intelligence. 
ring the form and arrangement of the pebbles to the en, agencies 
indicated. He does not however doubt that in some highly metamorphic | 
districts, conglomerate rocks are to be found which have stained great 
internal changes through the effects of heat, chemical action and violent 
pressure. Such he has long thought must have been the conditions in 
some parts of the Blue Ridge and South Mountain chain in the Middle 
States, and such perhaps were the influences which operated on the 
Gneissoid conglomerates of the Green mountains, to which Prof. Hitch- 
cock has referred in his recent communication to the Society. 
MixgraLocy.— 
4. Note on Chloritoid from Canada; by T. Sterry Hunt, F.R.S.— 
Among the crystalline Palaozoic schists of the Notre Dame Mts., which 
are the Canadian prolongation of the Green Mts., of Vermont, is a rock 
characterized by the presence of a mineral which has been designated 
in the Reports of the Survey by the name of phyllite, from the suppo- 
sition of its identity with a similar mineral from Massachusetts, de- 
Thompso 
a 
containing the mineral in question may be traced in the continuation of 
the Notre Dame Mts., as far as Gaspé. In the rock of Leeds the phyl- 
lite occurs in small lamellar masses rarely more than one-fourth of an 
inch broad and one-eighth of an inch thick. In some specimens it forms 
spherical agoregations half an inch or more in diameter composed of ra- 
diating lamellee and sometimes making up one-half the volume of the 
rock. In most localities however the masses are smaller and less abun- 
dant. The mineral has a vechis. cleavage in one direction and two less 
distinct transverse cleavages, ‘ the lamellz are often curved and are not 
easily separable. Hardness 6-0, density 3-513, color dark greenish-gray 
ich have 
a vitreous lustre ; the cross-fracture is granular and exhibits a feeble 
sc ustre. The str ee ge owder are greevish gray. ‘The mineral 
mbles somewhat a dark colored variety of hyper sthene’ oh analy- 
2 of a carefully eae’ specimen from Leeds gave as follows :* 
ee - - - pe sate aS 
Alum rs Sis ade peice ayin. -*. eee 
Protoeyd of iro - - - - - 25°92 
Protoxyd of manganese, - - - - 93 
Magnesia, - = - hit ween <0 * 3°66 
Water, - - . - - Sou is - 6°10 
100:01 
This analysis shows the mineral to be vehdieg with which its s 
“cific gravity and other characters agree. It s the barytophyllite of 
_Brei t, the masonite of Jackson and the ised of Delesse. All 
“of these minerals occur in argillaceous, micaccous or chloritic slates and 
* Report of Geol. Survey of Canada, 1858, p. 194. 
