356 MR. T. CARNELLEY ON AN ANALYSIS OF 



XL. Analysis of one of the Trefriw Mineral Waters. By 

 Thomas Carnelley, B.Sc. Communicated by Pro- 

 fessor H. E. Roscoe, F.R.S. &c. 



Read December iet, 1874. 



An analysis of this strongly ferruginous mineral water has 

 not, so far as the author has been able to learn, been pub- 

 lished before any scientific society ; and though two gene- 

 ral analyses of it have previously been made, the first by 

 D. Waldie, Esq., in 1844, and the second by Dr. Hassall in 

 187 1, and published in the form of pamphlets for public 

 reading by Dr. Roberts and Dr. Hay ward respectively, yet, 

 as it is peculiar for the extremely large quantity of iron 

 and alumina that it contains, and as its composition has 

 varied considerably since it was analyzed by the last-named 

 chemist (whose results also varied from those of the first), 

 it is thought that another and more complete analysis will 

 not be out of place. 



The village of Trefriw is situated on the left bank of the 

 Conway, about 2| miles from Llanrwst and between the 

 latter place and Conway. The springs, which now belong 

 to a company and are often visited by invalids, as they are 

 said to be good for the cure of diseases of the digestive 

 organs and of the skin, are close to the highroad which 

 runs between Conway and Llanrwst, and are rather over a 

 mile from the village. The entrance to them is a short 

 way up the side of the mountain called the Alt cae Coch, and 

 consists of an underground passage cut in the rock. There 

 are at present two springs (formerly there were three) — one 

 opposite and close to the entrance, the other at the end of 

 a gallery 10 or 12 yards long to the right. The former 

 water is used to supply the baths, and the latter exclusively 



