In the Geological Magazine for July appears an article by Mr. Charles Dawson on Ancient and Modern Dene Holes. As Mr. Dawson mentions Essex deneholes, and comes to conclusions contrary to those arrived at by Mr. Cole and myself, the authors of the Report of the Essex Field Club on the Deneholes of Hangman's Wood, near Grays Thurrock, I shall be glad to be allowed space for a reply. For though our views do not appear to be injuriously affected by Mr. Dawson's remarks, yet as the Denehole Report is now more than ten years old it is probable that few of the readers of the Geological Magazine have both seen and remember it. And the impression which the reader would derive from Mr. Dawson's article is, that his Bell Pit hypothesis is something quite new, and therefore unnoticed by us, whereas it was an old view before the Report was written, having been put forward by the late Roach Smith in the Gentleman's Magazine in 1867; and an account of workings for chalk, of the kind described by Mr. Dawson, written by Mr. F. J. Bennett, of the Geological Survey, is appended to the Denehole Eeport.