in Dover Castle, as being in a somewhat similar position, but there it is generally supposed to be a lychnoscope for the use of soldiers in the guard-room, so that they might watch the light burning at the altar on the south-east of the nave, which was specially reserved for them. There is a great difference of opinion as to the proper name of these openings, two of which are certainly, and another possibly, found in St. Martin's Church. We are told that the squint is not to be confounded with low side-windows or lychnoscopes, originally unglazed. Squints, as a rule, may be defined as inside the church, and the others outside, primarily for the purpose of enabling persons in the aisles to see the elevation of the Host at the high altar, though they are sometimes found connected with a side-chapel, a parvise, or a tower-chamber. Their usual height is about 4 ft. from the ground, extending upwards from 2 to 10 ft. Narrow at first, they were gradually enlarged and broadened, as at St. Clement's and St. Peter's churches in Sandwich. Sometimes when near a side-altar they were utilised as a credence, or had a _piscina_ sunk in them (_cf._ Crawley Church in Hampshire)--and it is not impossible that the only real squint or hagioscope in St. Martin's Church was through the back of the existing piscina. The other openings, as I have said, might have been used as lepers' windows, or for penitents. The tower was added in the fourteenth century. It is somewhat squat, and crowned with a pyramidal top. It measures 16 ft. by 13 ft. 3 in. in length and width, with two large buttresses on the west side, each projecting 4 ft. 3 in. It is built principally of flint with a slight intermixture of thin mediæval tiles, and has three louvre windows, one of which, with the peculiar "long and short" features of Saxon stone work, may have been transferred there from some other portion of the church. The building of this tower has probably destroyed some interesting feature, that stood at the west end of the original church. This may have been a western apse (so common in early basilicas) or perhaps a baptistery, or a chamber with an arch on each of its four sides. Whatever it be, is at present a matter of conjecture, but further explorations may solve the mystery; and wise men will forbear to dogmatise, when their positive theories may at any moment be overthrown.