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Ibid. line 5 from the bottom, for “piles,” read “piers.” Page 53, the wood-cut at the bottom of this page should have exchanged places with that near the top of p. 54. Page 55, column 2, line 1, for “A, B, 4, D,” read “A, B, C, D.” Ibid. column 2, line 2, ...