Pie a. 
167 
accounts for the red ochreish deposit we notice on the drinking 
fountain. 
The amount of iron in the water at the drinking fountain 
King’s Bath is not by any means constant ; it varies as much as 
20 or 25 per cent., and at times, no doubt, very much more. 
A pipe from the source of the spring communicates with the 
drinking fountain ; and the engine which pumps the water up this 
pipe also fills the Tank which you will notice in rear of the 
Baths. Now, when the engine is not at work, the fountain is 
supplied from this Tank ; and the consequence follows that the 
water being exposed loses its carbonic acid gas, which causes a 
proportionate quantity of the iron to be deposited, and will 
account for the variation noticed. On the other hand, when the 
supply comes direct from the spring, a change in the taste of the 
water will be remarked, and the greater amount of iron may 
then be clearly detected. 
Tn the analysis of the Cross Baths you will observe the relatively 
large amount of Calcium and Sulphuric Acid, and the small amount 
- of iron, as compared with that of the King’s and Roman Baths. 
I particularly draw your attention to the Iron in the Cross Bath. 
Now we should naturally expect to find a proportionately larger 
amount ; I confess it puzzled me at first when working out the 
analysis, but a few minutes reflection showed the reason of it. 
The nearest accessible source to the spring at this Bath was the 
bathing place itself, the grating over the spring being soldered into 
the stone work, there was no help for it but to take the water from 
the bathing place when first refilled after cleaning out. The Cross 
Bath is emptied on Sunday morning, and it takes till the following 
morning to refill it, so that when, the water for analysis was col- 
_ lected at 7 a.m. on the Monday, it had been exposed for many 
hours ; and consequently, all the excess of carbonic acid gas, which 
had probably held in solution some twenty-five per cent of the Iron 
had gone off, leaving that metal deposited. I will explain to you 
what I mean by the excess of this gas. Water will contain a 
