17 
diate neighbourhood, and have been maintained for a 
sufficient period until he was able to determine what 
was the law which governs the fall of rain in the various 
portions of the area surrounding Croydon. On the 
completion of the observations at the end of the year 
1887 some of these rainfall stations have been continued, 
for wherever the observers were desirous of continuing 
the observations they were left in the possession of. the 
rain-gauges, and the records from these gauges were 
taken over and have been published by this Society 
since 1887. 
As showing the enormous difference in the rainfall 
at the top and-bottom of the drainage area of the 
Croydon branch of the River Wandle, it may be men- 
tioned the gauge which the Author maintained at 
Botley Hill Old Toll Bar at the top of the drainage 
area at an elevation of a little over 870 feet above 
ordnance datum that in ten years, 1878 to 1887, the 
average rainfall at this station was found to be 34°68 
inches per annum as against 24°68 inches the rain 
collected at Brimstone Barn at the bottom of the area 
at an elevation of 130 feet above ordnance datum. 
For the five years 1881-85 Mr. Henry Storks Eaton, 
M.A., F.R.Met.Soc., investigated the temperature and 
rainfall of Croydon and its neighbourhood, and 
prepared and presented a report for the Meteorological 
Committee of this Society. In these five years the 
average rainfall at Botley Hill was shown to be 31:94 
inches, and at Brimstone Barn 23°25 inches. In Table 
1X. of the report then presented 21 rainfall stations 
are used; 15 of these stations were stations established 
by the Author for investigating the question of water 
supply in this neighbourhood. 
- When it is considered that the temperature in all the 
Difference in 
rainfall at top 
and bottom of 
drainage area. 
Mr. H. S. 
Eaton’s In- 
vestigations, 
