Volcanic Fires. ] 5 



Mr. Mitchell observes, that the agitations of the earth from the 

 great earthquake at Lisbon were felt in this country about the same 

 time after the shock, as sound would have taken in passing from Lisbon 

 hither; and thence ascribes these agitations to the vibrations of the 

 solid earth, and not to subterraneous caverns of communication; 

 Philos. Transact. But from the existence of warm springs at Bath 

 and Buxton, there must certainly be unceasing subterraneous fires at 

 some great depth beneath those parts of this island; see on this sub- 

 ject Botanic Garden, Vol. II. Canto IV. 1. 79, note. For an account 

 of the noxious vapours emitted from volcanoes, see Botanic Garden, 

 Vol. II. Cant. IV. 1. 328, note. For the milder effects of central 

 fires, see Botanic Garden, Vol. I. Cant. I. 1. 139, and Additional 

 Note VI. 



