_Ballyhoe_ Lake, distant about five miles from Carrickmacross, was described by G. Morant as situated on the southern verge of the county Monaghan, the greater part of it being in Meath. The lake, of horse-shoe form, is of tolerable extent; the river Glyde, or Lagan, runs through it, and by this stream it is connected with several lakelets lying more northward in the county Monaghan; at the toe of the horse-shoe, owing to the large deposit of mud brought down by the river, the water is very shallow. In this lake were two artificial islands, one of great extent, the other much smaller. In the larger island, to which a causeway led from the mainland, were numerous mounds which had been partially excavated, and here were found two fine specimens of bronze pins, other articles of lesser interest in lead and iron; also a flint spear-head. The shores of the lake were for the most part boggy and full of large timber, stumps and stems appearing in great quantities, both above and below the level of the water, which was reduced several feet by the drainage of the river. The centre of the horse-shoe was occupied by a peninsula of bog-land with a coating of grass: this tract also abounded with timber, the stumps in many places projecting above the soil. In August, 1864, on the east shore of this peninsula, were observed two chert spear-heads lying just beneath the water at its lowest summer level, and a few yards further along the beach was a rude stone hatchet, about six inches long and two inches deep in its broadest part. The following spring, when the winter floods had subsided, measures were taken to search very carefully, and the result was the collection of a great many flint implements of various types, the greater number of which were lying only a few inches below the surface of the soil, and generally ashes were found with them. In one place a dark-coloured glass bead of barrel-shape was with the flint-flakes, and close to the stump of a large tree was a very fine polished stone hatchet with squared sides, the edge sharp and quite uninjured. In one of the holes made in the bog by the feet of cattle lay a beautiful little arrow-head of dark flint, triangular in shape, chipped to an exquisite sharpness, and curved inwards at the base to form the barbs. With the flakes, knives, scrapers, arrow and spear-heads of flint, were also many specimens in chert or Lydian stone. Near the exit of the river from the lake two different types of light-coloured flint arrow-heads were discovered, the one barbed, and about one and three-quarter inches, the other two inches in length, and of peculiar form; the latter lay where a deep cutting had been made during the drainage works, and near this spot was anciently a ford, the scene of several encounters between the Danes and Irish, and where in later times the forces of Elizabeth, and the Irish under Tyrone, met in battle array. In a field on the Meath side of the river, stood a castle