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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Madam How and Lady Why by Charles Kingsley: calculations, and said:
"You will go through so many feet of Bagshot sand; and so many
feet of London clay; and so many feet of the Thanet beds between
them and the chalk: and then you will win water, at about 412
feet; but not, I think, till then."
The well-sinker laughed at that, and said, "He had no opinion of
geologists, and such-like. He never found any clay in England but
what he could get through in 150 feet."
So he began to bore--150 feet, 200, 300: and then he began to
look rather silly; at last, at 405--only seven feet short of what
the geologist had foretold--up came the water in a regular spout.
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