Mineralogy, Geology, &c. 36 
you shouid think otherwise I trust you will excuse me for 
troubling you on the subject. I have forwarded some of 
the crystals* of selenite, found in this vicinity during the 
last season, a description of which was published in severa! 
of the newspapers of the day, which possibly you might 
have seen. 
I have the honour to be, with respect, yours, &c. 
JOHN P. JENKINS. 
Pror. SinLiman. 
2. Noteces in Geology and Mineralogy, communicated in a 
letter from Dr. Lyman Foor, of the United States army- 
Plattsburgh, 15th of June, 1819. 
Dear Sir, 
Our route from Niagara to this place was very interesting 
to me. We came down Lake Ontario to Sackett’s harbour, 
and thence down the St. Lawrence to Salmon river, and 
then up Salmon river to French mills, from which we march- 
ed across the country to this place, a distance of sixty-five 
miles, the greater part of it an uninhabited wilderness. I 
was careful to preserve specimens of the different rocks, and 
believe I could point on a map to the different rock forma- 
tions of the country through which we marched. 1 took 
some pains to examine the country from Fort Niagara to 
Buffalo as it appeared on the Niagara river. The river 
Niagara, thirty-five miles in length, forms the well known 
water communication between Lakes Ontario and Erie. Its 
width is from half a mile to six miles. From Fort Niagarat 
to Lewistown, a distance of seven miles, the borders of the 
river are nearly perpendicular, and from fifty to seventy feet 
in height. They are composed principally of hard clay, 
resting on a bed of red sand stone. In some places large 
*They are of the usual form, tolerably distinct, and imbedded in 
clay.—Ed. 
+t Fort Niagara is situated on that point of land where the river empties 
into the Lake ; was built by the French about the year 1725, surrendered 
to the British troops under command of Sir William J ohnsoni in 1759, and by 
the treaty of 1783, fell within the U. States. 
