Strontian, of Lake Erie, &c. 281 
tand, stands a solitary islet, oblong, with precipitous sides of 
about sixty feet high. It may be a third of amile in length, 
and lies nearly north and south. 
t the south end it is mhershie well wooded ; but scanti- 
ly at the other. 
The rock of which it consists is Limestone, of a pale 
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 inthe face of the 
cliff isa 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 ro ti 
six sided prism is to be distinctly traced. Drusy cavities 
are numerous in the mass. Here the crystals are petits 
and of enormous size. Major Delafield, (agent under the 
6th and 7th Art. Treaty of Ghent,) met with one weighing 
six pounds. 
Professor Douglass has described them mineralogically. 
a aa Celestine also occurs on the island of Celeron 
Grosse isle at the mouth of the Detroit river, where it 
appears to have combined in some oe with the lime stone, 
increasing the specific gravity of the la 
This lime stone prevails over a cualieeistad 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- 
ing. cepting on the south and south-east, it is surroun- 
ded by alluvial country of some hundred miles radius. 
It is curious to observe that the foreign matters in this 
rock are deposited in fields or districts, and to a certain ex- 
tent do not intermix. I observed no organic remains on 
Moss island—no Strontian on the adjacent main, but multi- 
tudes of imbedded shells, —— (small) and a beau- 
tiful form of trilobite—together with various madrepores 
wrought in lime stone, eigccially a stellular radiated spe- 
