60 
about 40 gallons per hour; its temperature varies only 
within very narrow limits and is quite cold. As it occurs 
in the spring it is perfectly clear, bright, and colourless ; but 
after a short exposure to the air it turns yellow and deposits 
flakes of ferric oxide ; it has no smell, but possesses a strong 
and very disagreeable inky taste. On being shaken up in 
a closed bottle no disengagement of gas takes place ; it has 
a strongly acid reaction, and contains neither free carbonic 
acid, carbonates, nor sulphides ; and when first taken from 
the spring is perfectly free from ferric salts. 
The following (I) is the analysis made of the water col- 
lected by the author on September 8th, 1874, together with 
that (II) made by Dr. Hassall in the early part of Septem- 
ber, 1871,^ or just three years previously. 
Temperature of the External Air... ...... 15’5° C. 
,,, „ Air at the Spring,,, 12’5° C. 
„ „ Water 110° C. 
Specific Grravity at 1 ^° C. 
I. 
1*00716 
II. 
1*00570 
j 
Paets pee 1,000,000. 
T;nss nn ignitinn 
7217*5 
32*8 
Precipitate formed on boiling 1 hour 
Iron 
— 
1507*0 
233*3 
271*3 
134*1 
31*5 
25*1 
trace 
0*80 
1*63 
0*34 
157*0 
4985*3 
11*8 
9*1 
2*45 
2009*4 
11*2*4 
116*5 
45‘4 
Alumi nium 
Calcium 
Magnesium 
Potassium 
Sodium 
15*3 
trace 
Manganese 
Eead ... .. , 
Ammonium (NH 4 ) 

Albumenoid Ammonia 
Silica fSiOo) 
149*0 
4512*0 
10*9 
Sulphuric Acid (SO 4 ) 
Chlorine 
Nitric Acid (NO 3 ) 
Phosphoric Acid (PO 4 ) 
Total Solid Contents 
7370*78 
7370*00 
6970*9 
The Eesidue dried at 310° C 
* See “Gruide to Trefriw and Vale of Conway Spa,” by Dr. J, W, Hay- 
ward, M.D.j M.E.C.S, Second edition. 
