236 Miscellaneous Notices in Mineralogy, Geology, &c. 
: 
the throat is produced by a free use of the spring. Iron is 
evidently the chief mineral ingredient of this water, but I 
was destitute of tests for satisfactory examination. A yellow 
deposit is observable in vessels containing standing water 
from this spring, and less effect is produced upon the water 
by astringent extracts. A patient afflicted by the rheuma- 
tism, attended by much debility has been greatly relieved 
by a free use of the spring for a few days, and a complete 
cure is anticipated. 
Mount Prospect, above mentioned, is a rocky, wood clad, 
elevated ridge, of two miles extent. From its summit an 
interesting and diversified view is presented of villages, and 
lakes, and of a well cultivated, healthy country. Sienite, 
rendered porphyritic by erystals of feldspar, is the predomi- 
nant rock of the mountain ; it presents ledges of considera- 
ble height and extent. Beds of sulphuret of iron are ob- 
served on both sides of the mountain, sometimes exhibiting 
a white efflorescence. | ative sulphate of iron has been col- 
lected on this mountain, and used in dying by the adjacent 
inhabit nts. The spring is already much resorted to, and 
has excited considerable interest. . 
Postscript. 
Th an additional letter from Mr. Pierce, dated March 20, 
1821, we are informed that the above mentioned “ mineral 
spring has attained considerable reputation, and effected 
cures of obstinate rheumatic complaints, that have resisted 
ordinary remedies: its water has been sent for weekly from 
Hartford, and has been considered equal to that of the 
‘ord spring.” £3 
13. Chalybeate Spring at Catskill—Marl and Tufa, és the 
Extract of a letter to the Editor from Jeniag: Pierce, Esq. 
-... dated Litchfield, March 20,1821. me 
: vered at Catskill last fall, a enpiurs ‘tester faitcis 
2 spring, within half a mile of that village, as rich 
any water in America. With an @ 
or oak bark, it makes a tolerable writing 
