25 
which is not held to be so good as that from permanent) 
sources. This no doubt is due to its coldness as com- 
pared with permanent springs. 
In the year 1881, and at other times, the Author, in 
conjunction with Messrs. Wigner and Harland, made 
a prolonged series of investigations both as to the 
temperature and the analysis of the waters of the 
Bourne flow and the waters of the wells of the district. 
The following Table gives the result of one of these 
investigations, beginning with the waters flowing south 
from Oxted Tunnel out of the North Downs, the 
waters in Godstone Stone Quarries, and the waters in 
the Caterham Valley, down to the mouth of the Bourne 
Culvert at Croydon. In the whole twenty-one tempera- 
tures and separate analyses of the water were taken 
when the Bourne was flowing on the 3rd February, 
1881, | 
(See next page for Table.) 
Temperatures 
and analyses 
of Bourne 
flows. 
