Notice of tlie Thermal Springs of North America. 91 



Here, as we ascend the so-called Warm Spring mountain, we 

 observe the very same rocks, successively presented to us, which 

 we had seen to the west of the Hot Spring, equally vertical in 

 the immediate neighborhood of the spring, dipping in the reverse 

 direction, at a high angle, farther to the west, and at length sub- 

 siding to a moderate inclination, at a still greater distance from 

 the axis of elevation. 



Such are the particulars, which were originally communicated 

 to me by Professor Rogers, and which I had myself the satisfac- 

 tion of verifying on the spot ; and I am the more pleased in com- 

 municating them, as they supply another, and that a striking ex- 

 ample, in addition to those I have adduced from other parts of 

 the globe, of the connection of Thermal Springs with great phys- 

 ical disturbances. 



To these particulars I may add, that the Sweet Spring, the 

 only other instance of a thermal water which this country exhib- 

 its, is situated, according to Professor W. B. Rogers, in a locality 

 which evinces a considerable disturbance in the strata, as is rep- 

 resented in the section appended to his Report. 



In Buncombe County, North Carolina, in the midst of a moun- 

 tainous region, occurs a thermal water, possessing a temperature 

 of 1250Fahr. 



The rock from which it gushes, according to Professor Yan- 

 uxem, is the calciferous sand-rock, the earliest member of the 

 Silurian system, or that resting immediately on the primary. 



The layers of the rocks are very irregular, more or less vertical, 

 and of a white color, but at a little distance to the west, they 

 present the blue color common to the rock where the lime is in 

 excess, and clear, well defined lines of separation dipping to the 

 east. 



The calciferous with the primary rocks to the east form a syn- 

 clinal (qu. anticlinal) line, as is the case near the Hot Spring of 

 Virginia. 



To the west of the Alleghanies, in the State of Arkansas, at a 

 distance of more than two hundred miles west of the Mississippi, 

 not far from the river Washita, is another group of thermal waters, 

 which I took occasion to visit in the course of the last spring. 



They are very numerous, bursting out from the side of a steep 

 acclivity which they have in process of time incrusted over with 

 a thick coating of stalagmitic matter. It is remarkable that the 



