A Last of Minerals and Organic Remains. 71 
of two tables, one of which is white, and slightly translucent; 
the other is white, hyaline, with high translucency. This 
limestone forms a horizontal-girdle around the trap moun- 
tain of Montreal, whence, as from a centre, large veins or 
dykes of trap radiate into the adjacent limestone, to the dis- 
tance of two miles, in some cases, to my own knowledge, and 
even to La Chine, according to information received from 
M. Burnet; chief engineer to the La Chine canal. The 
limestone in its upper strata is brown and crystalline; but 
black, compact and slaty below. It contains in immense 
quantities the organic remains peculiar to the mountain 
limestone of England and Ireland. 
Common Apatite. — Fort Wellington, U. C. Ina rolled 
aggregate of quartz, anthophyllite and cale. spar. In six si- 
ded prisms from one sixth to one fourth of an inch in di- 
ameter, usually short, sometimes long, confusedly aggrega- 
ted, sometimes in great numbers; they are often equiangu- 
lar, and are more or less truncated on the lateral and 
terminal edges, now and then so much as to produce four 
and five sided prisms. They are opaque—the colour be- 
ing greenish white, green and light blue, I! have one fine 
crystal in which these colours blend in clouds. 
Fibrous Gypsum.—In limestone on the river Ouse, which 
enters Lake Erie on the north shore. Indians have 
brought this mineral from near Cabot’s Head in Lake Hu- 
ron; that from St. Martin’s Islands near Michilimacinac has 
been long known. 
Selenite has been found: on the Great Manitouline in 
Lake Huron by Lieut. Bayfield, Royal Navy; and has 
been received from that vicinity by Mr. Schoolcraft. It is 
in nodular geodes, whose sides are brown limestone wholly 
occupied by favosite. The same geode sometimes con- 
tains radiated celestine. Selenite is found abundantly in 
the horizontal limestone of Hudson’s bay. I have seen 
it from thence in transparent masses of very large size. _ 
Fluor.—At the bay of St. Pauls, sixty miles below Que- 
bec, in the ravine of the stream which turns the  seignioral 
mill, disseminated plentifully in green crystalline masses, in 
white marble which is a thin layer in compact blue lime- 
stone, alternating with gneiss. 
It is found in the transition limestone of Cape Diamond, 
in a druse superimposed on white calc. spar.. If any crys- 
