64 Mr. William Wliitaker im some 



A tracing communicated by Mr. S. C. Homersham differs in 

 the following details : — 



1. As to the jmiction of Eeading and Thanet Beds, as follows : — 

 Instead of "light grey sand," classed as Thanet, gives "green 

 sand, clay, and pebbles," which would be classed as Reading. 

 This is succeeded by " grey sand" which of course falls mto the 

 classification above, as Thanet. 



2. Makes the flints end about 246 feet down in the Chalk, and 

 shows a 3 -inch layer of dark clay some 7 feet lower. 



3. For the depths to the base of the Chalk and of other under- 

 lymg formations agrees with the figure in Prof. Judd's paper, 

 which, as above noted, differs slightly from the text. 



According to a communication from Mr. W. Russ, in the earlier 

 days of this well, when it left off" in Upper Chalk, at a depth of 

 439 feet, the water rose slowly to the surface, on pumping being 

 ceased, and overflowed at the rate of 2 gallons a minute ; whilst 

 the yield was about 300 gallons a minute when the water was 

 pumped down to below 130 feet. 



Southwark. — Barclay and Perkins's Breivery. New xvell. 1871. 



Sunk and communicated by Messrs. Docwra & Son. 



About 12 feet above Ordnance Datum. 



Shaft (and cylinders) 211 feet; the rest bored. Connected 



with the old well (disused) by a gallery, near the bottom of the 

 London Clay. 



Water-level 72^ feet down. [118 feet during pumping, April, 

 1877, according to Mr. J. Lucas.] 



Made ground 15 



[Alluvium, (Black peat 3 



20 ft.] I Blue bungham [■? clay] 2 



[Valley Drift, J Sand 1 



7 ft.] (Gravel 6 



Blue [London] Clay 79 



rMottled clay 4 



Sand 6 



Mottled clay 14 



Sand 3 



[Woolwich and Dark shelly clay 5 



Eeading Beds, -I Blue shelly clay 2 



59 ft.] Mottled clay 4^ 



White sand and pebbles 3^ 



[Green sand and pebbles ... 10 



[Bottom bed] j Brown sandy clay 4 



(Blue sandy clay 3 



Grey [Thanet] Sand 37^ 



Chalk, with flints '-^35 



437i 



