In the first place, without troubling ourselves for the time being with the diverse forms of the word as now existing, a difficulty meets us at the very outset as to how it ever got into the English language at all. 'It was left behind by the Romans,' says the pupil teacher unhesitatingly. No doubt; but if so, the only language in which it could be left would be Welsh; for when the Romans quitted Britain there were probably as yet no English settlements on any part of the eastern coast. Now the Welsh form of the word, even as given us in the very ancient Latin Welsh tract ascribed to Nennius, is 'Caer' or 'Kair;' and there is every reason to believe that the Celtic _cathir_ or the Latin _castrum_ had been already worn down into this corrupt form at least as early as the days of the first English colonisation of Britain. Indeed I shall show ground hereafter for believing that that form survives even now in one or two parts of Teutonic England. But if this be so, it is quite clear that the earliest English conquerors could not have acquired the use of the word from the vanquished Welsh whom they spared as slaves or tributaries. The newcomers could not have learned to speak of a Ceaster or Chester from Welshmen who called it a Caer; nor could they have adopted the names of Leicester or Gloucester from Welshmen who knew those towns only as Kair Legion or Kair Gloui. It is clear that this easy off-hand theory shirks all the real difficulties of the question, and that we must look a little closer into the matter in order to understand the true history of these interesting philological fossils. Already we have got one clear and distinct principle to begin with, which is too often overlooked by amateur philologists. The Latin language, as spoken by Romans in Britain during their occupation of the island, has left and can have left absolutely no directs marks upon our English tongue, for the simple reason that English (or Anglo-Saxon as we call it in its earlier stages) did not begin to be spoken in any part of Britain for twenty or thirty years after the Romans retired. Whatever Latin words have come down to us in unbroken succession from the Roman times--and they are but a few--must have come down from Welsh sources. The Britons may have learnt them from their Italian masters, and may then have imparted them, after the brief period of precarious independence, to their Teutonic masters; but of direct intercourse between Roman and Englishman there was probably little or none.