Major Delafield and Dr. Bigsby, §e. 279 
3. Notices of the Sulphate of Strontian of Lake Erie and De 
troit, River. 
Extract of a letter to the Editor from Major Delafield. 
New-York, November 12th, 1821. 
Dear Sir, 
I have the pleasure to present you two specimens of the 
Sulphate of Strontian, from Strontian Island, Lake Erie. 
The one, a large crystal* of the bluish white variety, in parts 
transparent and irridescent, and having its termination per- 
fect. The other the foliated and fibrous variety. [al 
send you its gangue, or a piece of the lime stone, in which 
ne of Detroit 
River, is generally like the specimen forwarded. I have 
= sn tame + 7 to 
ase and summit. The vein as now exposed, commences 
with a thickness of four feet, extends about fifty feet, nearly 
* Five inches in diameter in its extreme dimensions and two thick.—Fp 
