new Sulphur Spring at Harrogate. 89 



The cudiometrical method which I pursued is short, easy 

 and susceptible to great precision ; an error in the carbonic 

 acid, of one division of the tube, would scarcely affect .05 of a 

 cubic inch, the quantity in a gallon. 



The carburetted hydrogen, not being known to be medicinal, 

 is of little consequence in that point of view ; yet its presence 

 in these waters is a curious circumstance, the discovery of 

 which belongs wholly to Dr. Scudamore or his companion. 

 My experiments fix the proportion nearly as given by them, al- 

 though it seems quite unaccountable how they could arrive at it 

 by theirs *. 



To sum up the comparison between the water from the Old 

 Well and that from Mr. Thackwray's pump, — it appears that 

 both contain the same ingredients, solid and gaseous ; that the 

 New Well has rather the greatest impregnation of the gases ; 

 that the Old Well contains rather more common salt; while the 

 water of the New Pump holds a considerably greater propor- 

 tion of the active constituents, the muriate of lime and of 

 magnesia. 



'J'he experiments, which occupied several days, were per- 

 formed upon the spot ; many were repeated several times, and 

 through the greater part, I had the benefit of the able assistance 

 of Dr. Murray, of Knaresbro'. 



Leeds, Feb. 27, 1823. 



* Carburetted hydrogen gas requires for combustion twice its volume of 

 oxygen, (Sir H. Davy's Elements, p. 306,) instead of its own bulk, as these 

 experiments imply, and yields its own bulk of carbonic acid, instead of 

 one-third. How were such improbable results obtained? 



