76 



Proceedings of the Royal Irish Academy. 



Analyzing the gases set free at the water's surface, as the authors 

 did, and to which it would seem that Professor Daubeny confined his 

 examination for gases, and also analyzing the gases contained in a 

 measured portion of the water taken from below its surface, which the 

 authors were careful to do, in addition — these double determinations 

 enabled them to go far towards reconciling the apparently conflicting 

 views reported by Dr. Xnox. 



Moreover, the composition of the gas, as contained in the water, 

 and also the composition of the gas as set free in the spring, agreed so 

 nearly with the composition as calculated in Bunsen's chapter on 

 " Gases absorbed in Mineral Springs," as to be, in his words, a 

 " valuable confirmation of both analyses." 



The authors now beg to explain and state the results they obtained 

 for the gaseous and solid constituents of these Mallow waters; the 

 analyses having been conducted in the Laboratory of the Royal College 

 of Science, by the permission of Professor Galloway. 



The free gases and the gases absorbed in the water were both 

 examined. The absorbed gases were boiled out from 700 cub. cent, 

 of the water by the method described in Miller's " Elements of 

 Chemistry," part ii., pp. 55, 56; and the analyses were made by the 

 method adopted by Bunsen, as follows : — The gas was measured in an 

 absorption tube, the necessary corrections for temperature, pressure, 

 &c., being made; a bullet of potassic hydi-ate was then introduced, 

 and time having been allowed for absorption of carbonic acid, the 

 volume was again determined. The remainder was transferred to an 

 eudiometer, mixed with hydrogen and detonating gas, and exploded. 

 The several readings, reduced to 0° C. and one metre pressure, give 

 the necessary data for calculating the amount of the several con- 

 stituents. 



The following are the results : — 



Principal Spa. — Free Gases. 





Volume. 



Pressure. 



Temp. C. 



Vol.ato°C. 



and I metre 



pressure. 



Gas employed, .... 



121-0 



•6462 



19-4 



7306 



After absorption of CO2, 



IIT'O 



•6570 



19-2 



71-82 



Gas transferred to eudiometer, 



191-3 



■4314 



192 



77-11 



After addition of hj-drogen. 



219-2 



-4604 



lP-2 



94-29 



After explosion with detonating gas, 



206-4 



-4o7o 



21-6 



87-51 



