130 THE ESSEX FIELD CLUB. is unusually picturesque. The physiography of the neighbourhood is shown in the Map illustrating Mr. Holmes' "Notes on the Ancient Physiography of South Essex" (Essex Naturalist, Vol. ix., pp. 193-200). As regards geological structure, this district consists of London Clay, above which, at Hockley, Rayleigh, and Hadleigh, there is an outlier of Bagshot Sands, on which, again, there are patches of old High-level Gravel. Consequently the ground on which those places stand, is of unusual elevation, and commands very fine views. At the Station the party was welcomed by the Rev. R. C. M. Rouse, Rector of Rayleigh, who very kindly placed his carriage at the service of some of the ladies, and who accompanied us the whole afternoon, giving in the pleasantest way all the local information in his power. On leaving Hockley Station the building of classical aspect still known as Hockley Spa, and which was once the Pump Room, comes into sight, a few yards away on the road towards Rayleigh. Hockley Spa had a considerable reputation for its mineral water in the early years of the Victorian era. The waters were first mentioned in this connection by Dr. Benjamin Allen, of Braintree, in the 2nd edition of his book, The Natural History of the Chalybeat and Purging Waters of England, &c. (1711), but their celebrity mainly arose from the sinking of a well in the garden of a Mr. and Mrs. Clay (circa 1840), who "had determined upon building for themselves a cottage in this elevated region, they having escaped the relaxing and weakening effects of a long residence in Cheltenham." Soon the waters were puffed by the fashionable medicos of the day, and a detailed account of the. well and- the supposed medicinal virtues of the waters is given in Dr. A. B. Granville's Spas of England, 1841. But the fashion of "taking the waters" has died out, and for many years the Pump Room has been unused for its original purpose, though the "Spa Hotel," erected at the same time as the Pump Room, is still an inn. Mr. Holmes quoted a few remarks from Mr. Whitaker's Geol. of Lond. and part of the Thames Valley on the Spa and the local geology ; and Mr. F. Hughes, F.C.S., gave a verbal report of his analyses of the water, which were not then completed. [A full account of the history of the Spa and of the chemical nature of the Hockley waters, by Mr. Hughes and Mr. Cole, is reserved for a future number of the Essex Naturalist, when Mr. Hughes' experiments shall have been completed.] Leaving the "Spa," which in its present condition presented by no means a cheerful and festive aspect, the party walked along the road to Rayleigh as far as the "Ball fan," and then turned northward towards St. Peter's Church. The views northward along the route are very fine and were much enjoyed, the low narrow water parting between the valleys of the Crouch and Blackwater being visible between the higher ground of Althorne on the east and that between Woodham Ferrers and Purleigh on the west. And nearer, southward of the Crouch, was seen the site of the famous battle between Edmund Ironside and Canute, known as that of Assandun, or Ashingdon. In one of the most elevated of the fields, along the pleasant paths of which we were strolling, Mr. Holmes gave an address on the physical geography of the land, its geological features and some notes of the history of the spot in Saxon times. Mr. Holmes illustrated his remarks with a large series of geological maps, and the facts recorded in them could be