REPORT ON MINERAL AND THERMAL WATERS, 41 



Public Bath*, was followed, not only by a diminution in the 

 supply of water at the latter, but also in the amount of gas 

 emitted, which, according to the accurate observations of Mr. 

 George Spry, of Bath, made in the beginning of August in this 

 yearf, appears not to average at present more than 17O cubic 

 inches per minute, whilst the quantity of water discharged at 

 the original spring, was reduced from 120 gallons to 75, in the 

 same interval of time. 



Thus the relation between the decrease of gas and of water 

 kept pace very nearly one with another ; for, 



as 150: 222:: 75 : 111. 



The slight excess of gas may have arisen from the more scru- 

 pulous manner, in which Mr. Spry prevented its escape fi'om 

 all the apertures in the bath, excepting those from which he 

 collected it, than had been previously done by myself. 



1 have since estimated the amount of gas emitted from the 

 thermal spring of Buxton at about 50 cubic inches per minute, 

 and find that M. Longchamp determined the quantity at one of 

 the springs, Cauterets in the Pyrenees, as being about 7'1 cubic 

 inches, whilst he calculates that of the water given out by the 

 same during an equal space of time at 1584, or nearly 226 times 

 the amount. 



The above are nearly all the observations we at present 

 possess, with respect to the quantity of nitrogen emitted from 

 thermal springs, though it would be desirable to obtain in every 

 instance an exact register of this, as well as of the quantity and 

 temperature of the water itself, as affording us the data for de- 

 termining at some future time, whether any secular variation is 

 taking place in the quality of each spring in these several re- 

 spects. 



In the table, therefore, at the close of the present Report, I 

 have registered in two separate columns all the observations 

 I could collect, on the quantity of gas and water emitted within 

 the space of twenty-four hours by the spi'ings named. 



It is worth remarking, that an evolution of nitrogen gas is in cold 

 not altogether peculiar to thermal waters. springs. 



I detected it issuing pretty abundantly from a spring near 

 Clonmel, which possessed the common temperature of those in 

 the neighbourhood; another emitting the same has been de- 



* M. Arago, in his Annuaire for 1836, mentions, that the same falling off 

 of the hot spring of Aix, in Provence, took place in consequence of the sink- 

 ing of a contiguous well, but it is remarkable that in this case the water of 

 the latter was cold. 



t Viz. in 1836. 



