225 REPORT ON THE DENEHOLE EXPLORATION AT HANGMAN'S WOOD, GRAYS, 1884 and 1887. By T. V. HOLMES and W. COLE. [Drawn up by T. V. Holmes. Read November I2th, 1887.] With Plates III., IV. and V. Entrance to Hangman's Wood, from Grays. From a drawing by H. A. Cole, [In presenting this Report to our readers, it has been considered desirable to print with it several papers treating of matters pertinent to the subject in hand, which have been kindly supplied by the several writers mentioned below. These papers may be read as Appendices to the Report, and for convenience of reference, their titles are here given in the order in which they are printed :— REPORT. With three Plates and other illustrations. Addenda. (a) "Notes on some Chalk-wells in Buckinghamshire." (b) "List of Subscribers to the 'Denehole Exploration Fund.' (c) "Explanation of the Plates." APPENDICES. I.—"Note on the Bones found in the Deneholes in Hangman's Wood." By E. T. Newton, F.G.S., F.Z.S. II.—"Note on the Fragment of Millstone from a Denehole." By F. W. Rudler, F.G.S. III.—"On Chalk-wells." By F. J. Bennett, F.G.S. IV.—".Note on some Pits near Chipping Norton, Oxfordshire." By H. B. Woodward, F.G.S. V.—" Ensilage, or Preserving Grain in Pits." By F. C. J. Spurrell, F.G.S. A large amount of information as to the nature of the Deneholes in Essex and Kent will be found in Mr. F. C. J. Spurrell's paper on "Deneholes and Artificial N