Strontian, of Lake Evie, Sc: 281 
land, stands a solitary islet, oblong, with precipitous sides of 
about sixty feet high. It may be a third of amile in lengt h, 
and lies nearly north and south. 
At the south end itis tolerably well wooded ; but seanti- 
ly at the other. 
The rock of which it consists. is Limestone, ane a age 
greyish straw colour. It is soft, of an. earthy conchoidal 
fracture, having a granular structure. I do not recollect its 
stratification at this isle, but in the neighbouring districts it is 
placed in thick horizontal slabs, little prone to slatiness. 
About the middle of the east side, and in the face of the 
cliff is a mass of Sulphate of Strontian, about four yards by 
three in extent, ramifying every where, but most plentifully 
in the horizontal direction. It is in the form of promiscuously 
aggregated bundles of crystals united laterally, of a white or 
bluish white colour, imperfectly transparent and from one to 
four inches long. Although the confused manner of their 
crystallization has obscured their figure, yet the compressed 
six sided prism is to be distinctly traced. Drusy cavities 
are numerous in the mass. Here the crystals are perfect 
and of enormous size.’ Major Delafield, (agent under the 
6th and 7th Art. Treaty of Ghent,) met with one nieighing 
six pounds. 
Professor Douglass has described them mineraloivally. 
Foliated Celestine also occurs on the island of Celeron 
and Grosse isle at the mouth of the Detroit river, where it 
appears to have combined in some places with the lime Seene, 
increasing the specific gravity of the latter. 
This lime stone prevails over a considerable district of 
country—it is found at Sandusky, lines the shores of the 
Lake, nearest the bed of Strontian just described, and floor- 
ing the river Detroit near Amherstburgh is discovered in the 
interior on both sides of that river, and is quarried for buil- 
ding. Excepting on the south and south-east, it is surroun- 
ded by alluvial country of some hundred fiiles radius. 
It is curious to observe that the foreign matters in this 
rock are deposited in fields or districts, and toa certain ex- 
tent do not intermix. I observed no organic remains on 
Moss island—no Sitrontian on the adjacent main, but multi- 
tudes of imbedded shells, orthoceratites (snhall) and a beau- 
tiful form of trilobite—together with various madrepores 
wrought in lime stone, especially a stellular radiated spe- 
