50 Dr Daubeny 07i Thermal Springs, 



ken of it in any British Periodical, and as the conclusions to 

 which it leads seem intimately connected with some former in- 

 quiries of my own, which, though of a different description, had 

 reference, nevertheless, to the subject here under consideration, 

 I shall make no apology for embodying the substance of this 

 communication, together with the results of the latter inquiry, 

 in the following remarks on the general relation subsisting be- 

 tween the phenomena of thermal waters and those of volcanos. 



In the treatise which I published on the latter subject in 

 1826 *, my attention was principally confined to phenomena at- 

 tributed, as it were, by universal consent, to the agency of vol- 

 canos ; so that, in attempting to account for their operations, I 

 kept for the most part out of sight those effects, concerning the 

 origin of which a difference of opinion might obtain. 



I therefore excluded from my consideration the phenomena of 

 warm springs, not having at that time collected sufficient data 

 to satisfy myself, whether they ought, generally speaking, to 

 be attributed to the same deep-seated cause, as that which was 

 supposed to occasion the eruptions of a burning mountain. 



Feeling, however, that my undertaking must be considered 

 incomplete, until the question as to hot springs had been set at 

 rest, I have at intervals employed myself, ever since the pubh- 

 cation of the volume alluded to, in collecting facts, either from 

 personal observation, or the researches of others, calculated to 

 throw light upon the natural history of the latter. Of these in- 

 quiries, the results most connected with the question here al- 

 luded to may be divided into two heads : the former having re- 

 ference to the physical and geological position of thermal wa- 

 ters ; the latter to the gaseous products which accompany them. 

 And whilst the former, by associating their exalted temperature 

 with the general cause of subterranean movements, serves to 

 give a degree of extension to volcanic operations throughout the 

 globe, which we should otherwise be little disposed to admit, 

 the latter lends, if I mistake not, an additional testimony in fa- 

 vour of that mode of accounting for their existence, which, in 

 the treatise alluded to, I have attempted to confirm, by shew- 



* Description of Active and Extinct Volcanos. London, 1826. 



