Mr. W. Whitaker on some Surrey Wells. 133 



been done under anything near 200 feet of Tertiary beds, and 

 rarely under as much as 150. 



Before describing the sections it may be well to give a list of 

 those already noticed, and in this one need not always refer to 

 the original sources, such as papers by Prof. Prestwich and 

 Mr. Lucas, but, more conveniently, to the two Geolog:ical 

 Survey Memoirs, in which previous publications of well-sections 

 are included, sometimes with additions, and always with acknow- 

 ledgment of the original authority. 



The first reference, then, is to vol. iv. of the Memoirs, " The 

 Geology of the London Basin, Part I," 1872, in which 83 Surrey 

 wells, at the following places, are described (pp. 537-563) : — 



Ash, Bagshot, Balham Hill, Barnes, Battersea (2), Ber- 

 mondsey (12), Camberwell (3), Caterham, Chertsey, Uhobham, 

 Clapham, Croydon (2), Dulwich (2), Egham (wrongly put under 

 Berks), Esher (?3), Farnham, Forest Hill, Garrett, Horsleydown, 

 Kingston (5), Lambeth (9), Lower Morden, Mitcham, Mortlake 

 (2), Norwood, Old Kent Road, Peckham, Penge, Richmond (4), 

 Rotherhithe (3), Southwark (3), Stockwell Green(2), Streatham, 

 Sutton, Sydenham, Vauxhall, Wandsworth (4), Wimbledon (4). 



In my former paper ('Transactions' for 1886) the following 

 51 were added, with further information on three of the Ber- 

 mondsey wells noted in the above : — 



Anerley, Bermondsey (5), Brookwood, Caterham, Chelsham, 

 Chertsey, Coulsdon, Croydon (2), Denbies, Egham, Epsom (2), 

 Fetcham, Forest Hill, Frimley, Garrett, Guildford, Hatchfold, 

 Lambeth (3), Leatherhead, Maiden (2), Merton, Mitcham (2), 

 Norwood, Old Kent Road, Peckham (3), Reigate, Richmond, 

 Southwark (2), Streatham, Thames Ditton, Thorpe, Tooting, 

 Vauxhall, Walworth, West Molesey, Wimbledon (2), Worcester 

 Park. 



In a second Geological Survey Memoir, "The Geology of 

 London and of Part of the Thames Valley," published in 1889, 

 many of the sections in both of the above were reprinted, some- 

 times with additions, and many other Surrey sections were 

 added (vol. ii. pp. 183-239), the latter being at the following 

 places, and adding 86 to the list : — 



Barnes, Battersea (2), Bermondsey (3), Camberwell (2), 

 Dulwich, Egham, Ewell, Garrett (3), Hook, Leatherhead, 

 Merton (2), Mitcham (24), Southwark (2), Streatham (4), 

 Sutton, Tooting (24), Wandsworth (4), Wimbledon (9). 



Besides these there are two sections which, not coming within 

 the area described in the last Memoir, have not been reprinted ; 

 one at Ash (Rev. A. Irving, Proc. Geol. Assoc, vol. ix. p. 415), 

 and the other at Bletchingley (Spon's ' Water Supply,' ed. 2, 

 p. 218). 

 In the Memoir on "The Geology of the Weald" there are 



