The Rondö Light, also on the west coast of Norway (see p. 55), is 161 feet high, and is visible for 25 statute miles; the proper calculation will prove that it ought to be above 130 feet below the horizon! The Egerö Light, on west point of Island, south coast of Norway (see p. 56), and which is fitted up with the first order of the dioptric lights, is visible for 28 statute miles, and the altitude above high water is 154 feet; making the usual calculation we find this light ought to be depressed, or sunk, below the horizon 230 feet! The Dunkerque Light, on the north coast of France (see p. 71), is 194 feet high, and visible 28 statute miles. The ordinary calculation will show that it ought to be 190 feet below the horizon! The Goulfar Bay Light, on the west coast of France, is said at page 77, to be visible 31 statute miles, and to have an altitude at high water of 276 feet, at the distance given it ought to be 210 feet below the horizon! At page 78, the Cordonan Light, on the River Gironde, west coast of France, is given as being visible 31 statute miles, and its altitude 207 feet, which would give its depression below the horizon as nearly 280 feet! The Light at Madras (p. 104), on the Esplanade, is 132 feet high, and visible 28 statute miles, whereas at that distance it ought to be beneath the horizon above 250 feet! The Port Nicholson Light, in New Zealand, erected in 1859 (p. 110), is visible 35 statute miles, the altitude is 420 feet above high water, and ought, if the water is convex, to be 220 feet below the horizon! The Light on Cape Bonavista, Newfoundland, is 150 feet above high water, and is visible 35 statute miles (p. 111), this will give on calculation for the Earth’s rotundity, 491 feet that the Light should be below the horizon! Many other cases could be given from the same work, shewing that the practical observations of mariners, engineers, and surveyors, entirely ignore the doctrine that the Earth is a globe. The following cases taken from miscellaneous sources will be interesting as bearing upon and leading to the same conclusion. In the _Illustrated London News_ of Oct. 20, 1849, an engraving is given of a new Lighthouse erected on the Irish coast, The accompanying descriptive matter contains the following sentence:--“Ballycotton Island rises 170 feet above the level of the sea; the height of the Lighthouse is 60 feet including the Lantern; giving the light an elevation of 230 feet, which is visible upwards of 35 miles to sea.” If the 35 miles are nautical measure the distance in statute measure would be over 40 miles; and allowing the usual distance for the horizon, there would be 36 miles from thence to the Lighthouse. The square of 36 multiplied by 8 inches amounts to 864 feet; deduct the total altitude of the Lantern, 230 feet, and the remainder, 634 feet, is the distance which the Light of Ballycotton ought to be below the horizon!