OF THE GASES OF THE KING'S BATH SPRING. 13 



... Portions of the sides of the bath which are under cover. 

 e. Drains through which the water is allowed to discharge itself. 

 /. Stone cylinder eighteen inches in diameter occupying the centre of the bath, 

 through which the spring principally rises. 



APPENDIX. 



Received January 22, — Read January 23, 1834. 



Subsequently to the reading of the above Paper, I have had an opportunity of ex- 

 amining two tepid springs, which, since the setting in of the wet weather, have 

 broken out at the foot of St. Vincent's Rocks, Clifton, immediately below the cliff 

 from which the Suspension Bridge over the Avon was designed to spring, and on the 

 summit of which the Observatory is erected. 



The temperature of the one is 72°, that of the other QQ° of Fahrenheit ; and both 

 are continually emitting bubbles of gas, which I found to consist of 



Carbonic acid 3 



Oxygen 8 



Nitrogen 92 



103 



The circumstance may be worth noticing on two accounts. First, as evincing that 

 the cause, whatever it may be, of the heat, is not limited to a single spot, but is 

 diffused over a considerable space in the direction along which the chasm extends ; 

 thus confirming an observation made to me by that intelligent naturalist, the late 

 Mr. Miller of Bristol, that when, in consequence of rain, a new spring appears at the 

 foot of these cliffs, its temperature is generally higher than that of the ordinary springs 

 of the district : and secondly, as adding one additional instance to the catalogue of 

 those thermal waters, which are accompanied by an evolution of nitrogen gas. 



This is the more important, because, owing to the circumstance of the principal 

 tepid spring at Bristol, which is preserved for medicinal purposes, being covered over 

 at its source, it was impossible to ascertain from this one, whether the thermal waters 

 of this place agreed in that particular with those of other localities, or whetlier they 

 constituted an exception to the generality of this rule. 



January 22nd, 1834. 



