when the tiles are abundant they are used, especially in districts where stone is scarce, for quoins and for relieving arches over openings. Occasionally less rude and insignificant remnants of Roman work are met with in later erections, hut they seldom amount to more than a few squared stones; these should always be carefully examined, to see whether they retain any original features of interest, and their geological character should he noticed, especially if they are not the produce of the neighbourhood.
   The church of St. Mildred, at Canterbury, has many fragments of Roman tiles built into the walls among the flints; and it is my firm belief that most of the stones of the two quoins of the south wall of the nave, have also been taken from a Roman building; the majority of them are of larger size than are usually found in medieval work, especially of a date so early as this wall; and five of those in the western quoin, and six in the eastern, are of oolite, a material very rarely found in this 
   (continued from page 143) be distinguished by the redness of the pounded tiles and pottery with which it is made, instead of sand and gravel. The same materials may perhaps, occasionally, and to a slight extent, have been used in medieval buildings; but, -with the exception of some very late works at Colchester, no specimen which could be mistaken for Roman has ever come under my observation. Mr. Hudson Turner, in the introduction to his ' Domestic Architecture in England' (p. xxvi.), discredits the idea that this peculiarity in mortar is a certain evidence of Roman date; and he gives a translated extract, from an account of the repairs of Newgate in 1282, in proof that pounded tile was used in mortar at that time. But his quotation is inconclusive ; the document to which he refers is probably written in Latin, with contractions, and it may be that the broken tiles which he has supposed to be for making mortar, were provided pro cement., that is, "procementariis," for the masons, or wallers, and were intended to be used for some other purpose, perhaps to be laid under some of the thinner stones, where required to bring them up to the general level of the courses, as was frequently done in medieval erections. Tiles, mostly broken, were also much used in medieval times for the backs of fireplaces, and were considered to be peculiarly fit for works exposed to the action of fire. Antiquaries who wish to gain credence for opinions based on ancient documents, must set forth the documents fully, and in their original language.