496 MESSES. WHITAKER AND JUKES-BROWNE ON [Aug. 1 894, 



As already stated, it is possible that the base of theGault maybe 

 as low as 625 feet, in which case the Vectian is only 12^ feet thick, 

 but we are disposed to think the above is the most probable inter- 

 pretation, and in this Mr. Dalton agrees with us. 



III. The Winkeield Boeing. 

 General Remarks. 



In May, 1893, a deep boring was finished at New Lodge, the 

 house of M. Van de Weyer, in the parish of Winkfield (but only 

 about 100 yards from the border with -Bray), and over 3| miles 

 nearly W.S.W. of Windsor Castle. This site is in the London Clay 

 tract of the district known as Windsor Lorest, from which the work 

 has to some extent become known as the Windsor boring, a title 

 to which it has no right. 



During the progress of the boring we have been in frequent 

 communication with Messrs. Le Grand and Sutcliff, who made it. 

 To them we are indebted for a detailed section of the beds passed 

 through, and for various specimens. In this case also Mr. Dalton 

 was consulted by the well-sinkers. 



The site, at the southern border of the grounds, about 150 yards 

 from the house, and about 130 westward from Nobbscrook Farm, is 

 218 feet above Ordnance datum, the above measurements being 

 made not on the ground, but from an Ordnance map (Berkshire, 

 Sheet 31) on which the site had been marked by Messrs. Le Grand 

 and Sut cliff. 



A small pit was dug, to the depth of only 8 feet, when the 

 boring was begun, and with the intention of going no deeper than 

 250 to 350 feet. Consequently, provision was made only for a pipe 

 5 inches in diameter to be carried down 231 feet, or 17 feet into the 

 Chalk. It can readily be imagined, therefore, that great difficulties 

 had to be encountered, and that many expedients were resorted to in 

 order to take the boring more than 1000 feet deeper than the point 

 to which the pipes reached : indeed the engineers say, in a letter, 

 that, " hampered at every step, the marvel to us now is that we 

 ever reached the Lower Greensand," to get water from which was 

 the object of going so deep. 



It is for its success in this that the boring is notable, such success 

 being rare in very deep borings — putting aside such a case as Caterham, 

 close to the outcrop of the Lower Greensand, and various wells in 

 the Valley of the Med way, where a large amount of water is got by 

 borings through the Chalk and the Gault into the sand beneath. Of 

 deeper borings at sites in the London Clay tract of the London Basin 

 only two others have succeeded in getting water from the Lower 

 Greensand. One of these is at Loughton in Essex, where water 

 was found at the base of the Gault, and presumably therefore from 

 Lower Greensand, at the depth of 1096 feet ; whilst in the other, in 

 Kent at Chattenden, northward of Chatham, this formation was 

 entered at the depth of 1162 feet. The boring now described is 

 therefore the deepest as far as Lower Greensand is concerned, 

 including the case of Richmond, where the formation occurred at 

 the depth of 1140 to 1150 feet. 



