168 
certain amount of it, and that amount depends upon the tem- 
perature and pressure brought to bear on it; thus the mineral 
waters here, if collected at the source of the Spring, may then con- 
tain as much as thirty cubic inches per gallon, but if exposed to 
the air for some time, it will possibly contain only about half that 
quantity, and the difference is the excess to which I refer. Many 
of the Bath people have an idea that their Mineral waters are 
without change, and as this point had never before been noticed 
it occurred to me that a few experiments to prove how far this was 
the case might be interesting. No doubt some present may be 
aware with what extreme accuracy Chlorine may be determined, 
and I have taken advantage of this to give you some idea of the 
daily variation of these waters, I estimated the amount of Chlorine 
contained in each Spring, day by day, for the week ending February 
21st; the tabular statement which I now lay before you will 
show it. 
Bath Mineral Waters, 1874. 
Table showing the daily variation of Chlorine in the Waters for the 
week: ending February 21st (expressed in parts per million ). 
ee  - O 
Hetling | 278 | 279 | 277 | 278 | 278 | 278 
King’s 277 280 278 284 | 277 280 
Roman | 264 270 264 266 266 270 
Ps parts per million 
Greatest amount of Chlorine found was in the 
bie \ 284 
King’s Bath ‘ 
Smallest amount found was in Roman Baths . 264 
Greatest Variation—Hetling . , : 2 
5 5 King’s. . ; 7 
2 5 Roman . : : 6 
You will observe the lowest figure shown is 264 for the Roman 
Baths on the 16th February, while the highest is 284 for the King’s 
Bath on the 19th February, giving a variation of 20 parts per 
million. The King’s and Roman Baths, taken independently, 
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