The camp, though not greatly elevated, stands higher than the ground, either north or south of it. The country to the north, though generally flat, is studded with numerous hills of moderate elevation. On the sides of some of these, about two-thirds up, may be noticed a line that reminds the spectator of the parallel roads in Glenroy and other places. On examination, it is found to be an artificial cutting, made with evident reference to the maintenance of the water level. The sections given in Plate XVI., shew its size and form. In some places the water stands in it yet; in others a mass of peat fills it; and very frequently, where the channel has been obliterated, its course is shewn by a line of rushes, which grow on the damp ground. Wherever the water-course can be distinctly discerned, it has been laid down in the accompanying plan by a green line; where the traces of it are lost, the line of the water level has been pursued, and is indicated by dots of the same colour. [Sidenote: THE WATER-COURSE.] The whole length of the water-course is six miles; the distance in a straight line is little more than two miles and a quarter. It takes its commencement at the Saughy-rig-washpool, which is formed by the occasional damming up of the Caw-burn, at about a mile from its exit from the Greenlee-lough. In the immediate vicinity of the burn, the side of the water-course next the rivulet which would be endangered by the overflowing of the natural stream, is made up with flat stones put in endwise, some of which still remain as shewn in the section at B, in the plan. In its course to the station, in order at once to preserve the level, and avoid the necessity of using forced embankments or stone aqueducts, it is taken along the sides of the moderately elevated hills which rise from the plain. So ingeniously is this done, that once only has it been necessary to cross a valley by an artificial mound of earth. This has been at a spot between the third and fourth mile of the water-course, and which is still known in the district by the name of Benks-bridge, though probably few of the inhabitants are aware of the evident origin of the term. Some ingenuity has been employed in fixing the site of this mound. It is placed in that part of the valley where there is a slight descent on each side of it; the drainage of the surface is thus provided for without the use of a culvert; the surface water on the west, naturally making for the Halt-whistle-burn, that on the east for the river Tipalt. The mound which has taken the water-course across the valley at Benks-bridge has entirely disappeared, having probably been absorbed, in the course of ages, by the mossy ground on which it stood. The whole fall of the water-course, reckoning from the Wash-pool to the bottom of the arched chamber in the centre of the station is thirty feet. This is distributed over its entire length in