In addition to the earthen mounds and deep ditch, which usually formed the fortifications of these ancient strongholds, there were wicker-work stockades, or palisading, arranged on the top of the vallum. Such defences have been found at Uffington; and during the present year on the ancient fortifications of the old Calleva Atrebatum, afterwards the Roman Silchester, a friend of the writer has found the remains of similar wattle-work stockades. Evidently tribal wars and jealousies were not unknown in Celtic times, and the people knew how to protect themselves from their foes. Another important class of earthen ramparts are the long lines of fortifications, which extend for miles across the country, and must have entailed vast labour in their construction. These ramparts were doubtless tribal boundaries, or fortifications used by one tribe against another. There is the Roman rig, which, as Mrs. Armitage tells us in her _Key to English Antiquities_, coasts the face of the hills all the way from Sheffield to Mexborough, a distance of eleven miles. A Grims-dike (or Grims-bank, as it is popularly called) runs across the southern extremity of Oxfordshire from Henley to Mongewell, ten miles in length; and near it, and parallel to it, there is a Medlers-bank, another earthen rampart, exceeding it in length by nearly a third. Near Salisbury there is also a Grims-dike, and in Cambridgeshire and Cheshire. Danes' Dike, near Flamborough Head, Wans-dike, and Brokerley Dike are other famous lines of fortifications. There are twenty-two Grims-dikes in England. The name was probably derived from Grim, the Saxon devil, or evil spirit; and was bestowed upon these mysterious monuments of an ancient race which the Saxons found in various parts of their conquered country. Unable to account for the existence of these vast mounds and fortresses, they attributed them to satanic agency. There is much work still to be done in exploring these relics of the prehistoric races; and if there should be any such in your own neighbourhood, some careful digging might produce valuable results. Perhaps something which you may find may throw light upon some disputed or unexplained question, which has perplexed the minds of antiquaries for some time. I do not imagine that the following legend will deter you from your search. It is gravely stated that years ago an avaricious person dug into a tumulus for some treasure which it was supposed to contain. At length after much labour he came to an immense chest, but the lid was no sooner uncovered than it lifted itself up a little and out sprang an enormous black cat, which seated itself upon the chest, and glowed with eyes of passion upon the intruder. Nothing daunted, the man proceeded to try to move the chest, but without avail; so he fixed a strong chain to it and attached a powerful team of horses. But when the horses began to pull, the chain broke in a hundred places, and the chest of treasure disappeared for ever.