37 
Bourne culvert 1,089 feet per minute. On the 2nd 
March of the same year the quantity flowing into the 
Bourne culvert was 129 cubic feet per minute, and the 
flowing out 1,105 cubic feet per minute. On the 1st 
April, 1873, there was no water flowing into the Bourne 
culvert, but there was 864 cubic feet per minute flowing 
out of it. 
In the beginning of the year 1876, the Author com- 
menced a hydro-geological survey of Croydon and its 
neighbourhood, which he has continued from thattimeup 
to the present date. In the year 1876 he discovered that 
there was a Bourne flowing in the Caterham Valley 
below the ‘‘ Rose and Crown,” but at the time it was 
declining in flow, and on the 8th of May it was flowing 
below the ‘‘ Rose and Crown” at the rate of 73°63 cubic 
feet per minute. On the 4th of May of that year, the 
quantity observed to be flowing out of the Bourne culvert 
at Croydon was 478-7 cubic feet per minute. In conse- 
quence of the observations carried on in this year to trace 
the cause of the Bourne flows, the Author found previous 
to the next year the conditions had arisen necessary to 
produce a flow of the Bourne, and as a consequence he 
made an application to the Croydon Local Authorities 
for permission to line the Bourne channels in order to 
_ gauge the Bourne which was coming out, when owing 
to the discussion which took place on that occasion, it 
was stated by the Chairman of the Board, the late 
Mr. C. W. Johnson, F.R.S., that there could be no 
Bourne flow in Croydon, as there never was a Bourne 
flow unless there had been 30 inches of rain in the 
previous year. This discussion and the assertions then 
made induced the Author to make some careful calcu- 
lations, and the consequence was that he wrote a letter 
to the Croydon Chronicle on the 11th of January, 1877, 
Hydro-Geo- 
logical Survey 
of Croydon. 
Bourne flow- 
ing in 1876. 
Gaugings of 
1876 Bourne. 
Discussion of 
Croydon Local 
Board, 1876. 
Author pre- 
dicted Bourne. 
