’ $46 Mineralogy of Jefferson and St. Lawrence Counties, N.Y. 
the water. The addition of afew drops of a solution of sulphate of 
copper to the fluid, strikes a blue color instantly, thus denoting the 
presence of ammonia. On examining the residuary matter in the 
retort, it is found to be strong sulphuric acid. I know of no other 
rationale of this process, and think: it quite satisfactory. Of one 
thing, however, I am certain, and that is, that no other method that I 
have employed, yields the gas in question, so pure, and with so little 
trouble. It is, Rerehoees confidently recommended to all operators in 
chemistry. 
» Cincinnati, October 22, 1833. 
We ee} : 
> Re <2 + 
APSHA aR 
Art. XI.—A Sketch of the Mineralogy of a portion of Jefferson 
and St. Lawrence Counties, (NV. Y.); by Drs. J. B. Crawe, of 
~ Watertown, and A. Gray, of Utica, (N. Y.) 
- The northern part of the state of New York, has for a long time 
been known to contain many interesting minerals. But with the ex- 
ception of that portion which borders on Lake Champlain, this region 
hasnot received that notice from our mineralogists which its importance 
seems to deserve. In the spring of the present year, we visited this 
region for the purpose of collecting minerals, and had the good for- 
tune tc discover some interesting localities, a brief notice of which 
may not be unacceptable to the readers of the American Journal of 
Science. 
The underlying rock at Waibhowssy Sackett’s harbor, and through- 
out nearly the whole of Jefferson Co. is the metalliferous limestone 
of Eaton. This rock contains few minerals, but abounds in interest- 
ing organic remains. Orthoceratites, two to three feet in length are 
extremely common near Watertown and Brownville. Ammonites, 
Madreporites, 'Turbonites, &c.. occur. in great abundance. Two 
Trilobites, the Calymene Blumenbachw and the Isotelus gigas of De- 
kay, have been found near Watertown, but they are by no means 
common. In general this rock in Jefferson Co. contains the same 
petrifactions as at ‘a'renton Falls on the West Canada Creek. 
The Lenticular Carbonate of Lime is found inthis rock at Brown- 
ville, four miles from Watertown. A single specimen of Sulphate 
of Strontian in slender crystals, was found on the same Jocality. 
On the shore of Lake Ontario, a few miles N. E, of Sackett’s har- 
bor, at a place called Pillar Point, is a locality of Sulphate of Barytes. 
