THE 
AMERICAN 
JOURNAL OF SCIENCE, &c. 
GEOLOGY, MINERALOGY, &c. 
——— 
Art. I1.—On Volcanoes and volcanic substances, with a 
particular reference to the origin of the rocks of the fletz 
trap formation, by Tuomas Coorrr, M. D. President 
of the College of South-Carolina. 
[Read in the American Geological Society, December 3, 1821.} 
Columbia, (S. C.) Nov. 1, 1821. 
ProFressor SILLIMAN, 
Dear Sir,—I send you my Lecture on Volcanoes and 
Flcetz trap, delivered in my course here, this fall. I think 
the current of opinion in this country is against mine, and 
therefore the subject will probably give rise as it ought, to 
some discussion. I strongly suspect your sentiments onthe 
subject do not at all agree with mine; so. much the better : 
the more able my opponents, the sooner will truth be eli- 
cited. I shall draw outa full syllabus of my course of Lec- 
tures on Geological Mineralogy, forming the elements of 
that science for the use of my class, this winter, and shall 
_ probably publish it early in the summer. 
I am, Dear Sir, 
Your friend and servant, 
THOMAS COOPER, 
President S. Car. College. 
Vor. Lif.....No. 2. 1 
