192 



Proceedings q/ the Royal Irish Academy. 



Silica _ _ 



Sulpliiiric acid, calculated as SOi 



Chloiine 



Iron, calculated as Fe 



Manganese ,, Mn 



Lime precipitated on boiling, calculated as C'a 



Lime retained in solution on boiling, calculated 



as Ca 

 Magnesia precipitated on boiling, calculated as Mg 

 Magnesia retained in solution on boiling, calculated 



as Mg 

 Soda calculated as ISTa . . 

 Potash calculated as K 



Parts in 



Grains in 



one million. 



one gallon. 



12.1 



.847 



124.7 



8.729 



35.5 



2.485 



17.1 



1.197 



0.8 



.056 



56.0 



3.920 



24.8 



1.736 



2.7 



.189 



16.8 



1.176 



20.O 



1.435 



2.0 



.175 



"Wliicli may te calculated as being in combination tbiis : — 



Silica 









12.1. 



.847 



Fenic oxide, uitb ti-ace of alumina 





2.7 



.189 



FeiTOus carbonate 





31.7 



2.219 



Manganous „ 









1.7 



.119 



Calcic „ 









140.0 



9.800 



Magnesic „ 









9.5 



.665 



Calcic sulpbate 









84.3 



5.901 



Magnesic „ 









84.0 



5.880 



Sodic cUoiide 









52.1 



3.647 



Potassic „ . . 









6.4 



.448 











424.5 



29.715 



The specific gra-sity refen-ed to water at 15° C. was 1.0006. 



In tbe same enclosui'e with, the last mentioned, is another chaly- 

 beate, know as the ]\Iagnesian ii'on water. As it has now fallen into 

 disnse, it did not seem necessary to do more than determine the iron 

 which it contains. Calculated as carbonate, it was 14.9 iCgr per litre, 

 or 1.043 grains per gallon. 



Of that remarkable pair the "Twins," only one — the sulphur 

 water — was flowing ; it is essentially of the same character as tlie 

 Gowlaun water. It contains 2.052 cub. cent, sulphirretted hydrogen 

 per litre. The temperatui'e was 11°. 6 C, the air being 15°. 4 C. The 

 rate of flow was found to be one litre discharged in one minute and 

 twenty seconds, or about ten gallons in one hoiu\ 



