Gaugings of 
1887 Bourne. 
Bourne of 
1877 a recur- 
ring Bourne. 
Bourne of 
1878. 
38 
predicting that a Bourne flow would take place imme- 
diately below the ‘* Rose and Crown,” which would be 
followed by it breaking out in Marden Park. This 
Bourne proved to be a large Bourne flow; the flow 
commenced on the 18th of January, i877, and on the 
14th of February the quantity flowing below the “ Rose 
and Crown” at Coulsdon was 1,745°7 cubic feet per 
minute, and of the Bourne culvert at Croydon it was 
2,120 cubic feet per minute. 
From the year 1877 up to the present time the 
Author has predicted with perfect accuracy both the 
volume and date on which all the subsequent Bourne 
flows have made their appearance in the Caterham 
Valley. In the whole he has accurately predicted, 
between 1877 and 1903-4, thirteen Bourne flows, and 
there have been no Bourne flows or anything approach- 
ing a Bourne flow in any of the intermediate years 
when no Bourne fiow has been predicted. 
The peculiarity of the 1877 Bourne was that it was a 
recurring Bourne, that is, it rose to a high point and 
then fell and rose again, and subsequently declined. 
The gaugings of this Bourne flow are shown graphically 
in Plate No. 2. It should be observed with reference to 
the rise and fall in the Bourne flow that the water in 
the wells removed some distance from the Bourne flow 
show a corresponding rise and fall in their water line 
with the flow of the Bourne, but the wells near the 
Bourne channel which are near to the flowing stream of 
the Bourne, and all wells below the level at which the 
Bourne breaks out, show no fluctuation in flow, as the 
overflow by the Bourne prevents the water rising in the 
ground to a higher point than the natural overflow into 
the Bourne channel. ‘ 
In 1878 a very small Bourne appeared ; the Bourne 
