In connection with the Harbour at Hynish, I naturally notice the erection of a Beacon on a rock called Bo Pheg, which is dry only at low water of spring tides. It lies about one mile NE. from Hynish Point, (See Plates II. and X.) right in the track of the Tender in its passage to and from the Lighthouse. From the great difficulty of landing on that small rock, over which the sea almost continually breaks, even in very fine weather, the shortness of the time during which the men could remain at work, and the want of room on its irregular surface of about 16 yards square, the erection of a beacon proved to be a work of great difficulty. The Beacon consisted of an open frame-work of iron, (somewhat on the same plan as that which is described in the Appendix) and calculated to offer little opposition to the free passage of the waves; but before all the fixtures could be completed, the heavy storms of the winter of 1844, acting on its unfinished base (the bats of which were only partially secured), destroyed it piecemeal, at a season when no landing could be effected, nor any effort made to save almost any part of it from the sea. In the ensuing summer, a second Beacon, consisting of a hollow cone, composed of iron plates, united together by strong flanges and attached to the rock by _webbed flanges_ round its base with strong bats passing through them, was fixed down to the rock; and in order to increase its weight, the interior was filled with concrete gravel. That structure also has since yielded to the force of the waves, after giving slight indications of movement, an effect which I attribute chiefly to the smallness of the base, which the narrow limits of the rock unhappily prescribe. ~Lightkeepers’ and Seamen’s House.~ Another necessary part of the Establishment at Hynish, was the provision of dwelling-houses for the families of the Lightkeepers and Seamen and of Storehouses of various kinds. Those were partly built on purpose and partly consisted of altered forms of the buildings which had been found necessary as barracks for workmen and stores for materials, during the progress of the works. ~Concluding works on the Rock, such as pointing, &c.~ On landing on the Rock, on the 29th of March 1843, the Resident Engineer had the satisfaction of finding the whole building perfectly water-tight and saw not the slightest trace of a defective joint. The outside joints of the building were therefore carefully “ripped,” and repointed with mortar, composed of equal parts of Halkin lime and Pozzolano. That operation, from the difficulty of employing many men, where suspended scaffolds were necessary and from the care with which it requires to be executed, occupied a great deal of time. ~Interior fittings of the Tower.~