This being the third day after new moon, it was estimated the lowest ebb of the present spring-tides. The writer therefore caused a part of the site of the building to be reduced to what he considered a medium level of the whole. This he compared with low water-mark, as noted by the landing-master, at the moment when the tide ceased to ebb and began to flow. An assistant with a rod having been stationed at low water-mark previously determined, another was placed at the spot ascertained to be the medium level of the site of the building; a spirit-level was then set at a convenient position between these upright rods, when the writer found that the medium height of the site of the building, in the present rough and irregular state of its surface, was about three feet three inches above low water-mark of spring tides. By further observation, it was also found, that the highest part of the foundation of the building, in its present unprepared state, was six feet above low water-mark. This highest part consisted of a large rounded mass, which declined gradually on all sides, excepting on the north-east, where it was more abrupt. The writer had originally some thought of taking advantage of this part of the rock, by connecting it, after Mr Smeaton’s plan, with the lower courses of the building. But after working for some time, with this object in view, it was found to contain several large fissures, which rendered it more advisable to clear away the whole, and reduce the site of the building to a uniform level. [Sidenote: Full complement of Floating Buoys moored.] Finding it impossible, with any degree of safety, to carry to the floating-light, in the two boats belonging to this ship, more than eighteen artificers, and four seamen, together with the landing-master, the foreman and the writer, eight of the present complement of men were lodged on board of the Smeaton, and when she went to Arbroath for water and fuel, they necessarily accompanied her. Before sailing, she laid down a fourth mushroom-anchor, and mooring-chain, with a floating buoy, for the use of the praam-boat. It was not at all likely that there would be much use for so many sets of moorings for the operations of this season; but it was desirable to have the probable number laid down that might ultimately be required for the works, in order that the fitness of their respective situations might be ascertained, before they came to be wanted for the purposes of the building. This last buoy was laid down in four fathoms water, with twelve fathoms of chain, at the distance of about ninety fathoms, in a N.E. direction from the rock. The other three buoys were respectively moored at greater distances from the rock, in depths varying from seven to eleven fathoms, the mushroom anchors lying on a hard rocky bottom. [Sidenote: Floating-Light rides out a heavy gale of wind.]