WITH ANTICLINAL AXES AND FAULTS. 327 



to a deep subterranean source the remarkable uniformity of tem- 

 perature they exhibit. As, however, accurate determinations of 

 the atmospheric mean, as well as minute observations on the 

 springs at various seasons, are requisite in deciding with certainty 

 upon their thermal character, and as "we are yet very imperfectly 

 provided with these data, the question, with regard to a gi-eat 

 number of our bold springs, must still remain unsettled. I there- 

 fore restrict myself in the present paper to a notice of such as are 

 decidedly and unequivocally thermal. 



The following Tables comprise all the well-marked thermal 

 springs of Virginia, either previously known, or which have been 

 brought to light by myself and my assistants, in the survey of the 

 State. 



Table I, relating principally to the thermals which are best 

 known and most resorted to by invalids, includes, in regard to 

 most of them, a statement of the names and relative quantities of 

 the evolved gases, with the names of the gaseous and principal 

 solid ingredients. 



In Table II, these particulars are omitted, as being of less 

 present interest with regard to most of the springs it embraces, but 

 occasional notices are annexed of the evolved gases and of the 

 contents of the waters. I may add, that a minute account of the 

 ingredients of our thermal and mineral springs generally, derived 

 from a long series of analyses in which I have been engaged for 

 many years, will be made public in another form. It will be seen, 

 that some of the'springs, embraced in Table II, have a tempera- 

 ture but little above the atmospheric mean, yet their thermal 

 character is believed to have been fully established by the perma- 

 nency of this excess. 



