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 Giravity at 17° C 
I. 
1*00716 
II. 
1*00570 
Paets pee 1,000,000. 
Tjoaa on ignition 
7217*5 
U'PAP.i'nita.f.fi trirmfid on Tioilincr 1 bonr* .... 
32*8 
Iron 
1507*0 
2009*4 
Aluminium 
233*3 
11*2*4 
Ca.loinm 
271*3 
116*5 
Maernesium 
134*1 
45*4 
— 1 • « 1 • 1 * • • • • 1 • • < • 4 • • I • t • • • • • • • ■ t • • ■ t • • • • • • « • • • 
Potassium 
31*5 
Sodium 
25*1 
15*3 
Manganese 
trace 
trace 
Lead • 
0*86 
Ammonium (NH^) 
1*63 
- — 
Albumenoid Ammonia 
0*34 
Silica (SiOo) 
157-0 
149*0 
Sulphuric Acid (SO^) j 
Chlorine 
4985*3 
11*8 
4512*0 
10*9 
Nitric Acid (NO 3 ) 
9*1 

Phosphoric Acid (PO 4 ) 
2*45 
- 
Total Solid Contents 
7370*78 
6970-9 
The Eesidue dried at 310° C 
7370*00 
* See “ Gruide to Trefriw and Vale of Conway Spa,” by Dr. J, W. Hay* 
ward, M.D.j M.R.C.S. Second edition. 
