7. Excerpts from Account of Experiments on the Force of the Waves of the Atlantic and German Oceans, by Thomas Stevenson, F.R.S.E., Civil Engineer. 8. Annual List for 1848 of Lighthouses, Beacons, and Buoys, in the District of the Northern Lights Board. 9. Annual Report by the Secretary as to the Income and Expenditure of the Northern Lights Board for 1846. 10. Instructions to the Light-keepers in the Service of the Commissioners of the Northern Lighthouses. PLATES. I. Chart shewing the situation of the Skerryvore Lighthouse. II. Chart shewing the position of the Skerryvore Rocks and foul ground. III. Plans of the Skerryvore Rock at high and low water of spring tides. IV. Curves for Lighthouse Towers -- Marine Dynamometer. V. Barrack of timber on the Skerryvore Rock. VI. Details of fixtures of timbers at the top of the Timber Barrack. VII. Elevation of Skerryvore Lighthouse. VIII. Section of Skerryvore Lighthouse. IX. Balance Crane used at Skerryvore. X. Plan shewing the Lighthouse Establishment of Barracks, Harbour, &c., at Hynish, in the Island of Tyree. XI. Elevation and Section entrance to Dock at Hynish. XII. Plan and Section of Annular Lens. XIII. Perspective Elevation of Revolving Dioptric Apparatus of First Order. XIV. Plan of Revolving Dioptric Light of First Order, with Mirrors. XV. Vertical Section of fixed Dioptric Lights of First Order, with Mirrors. XVI. Elements of Concave Mirrors for Dioptric Lights of First Order, and arrangement on the Frame. XVII. Perspective View of Fixed Dioptric Light of First Order, with Catadioptric Zones. XVIII. Vertical Section of Fixed Dioptric Light of First Order, with Catadioptric Zones. XIX. Vertical Section of Catadioptric Light of Fourth Order, with Framing. XX. Elevation of Mechanical Lamp for Dioptric Lights of First Order. XXI. Enlarged Views of Oil-Pumps of Mechanical Lamp. XXII. Enlarged Views of Oil-Pumps of Mechanical Lamp. XXIII. Details of Clock-work of Mechanical Lamp. XXIV. Details of Clock-work of Mechanical Lamp. XXV. Flame of Mechanical Lamp of First Order at full size. XXVI. Elevation of Diagonal Lantern, and details of Astragals. XXVII. Elevation of Ardnamurchan Lighthouse. XXVIII. Plan of Ardnamurchan Lighthouse. XXIX. Lines of a Floating Light Vessel belonging to the Corporation of Trinity House of Deptford Strond. XXX. Elevation of Covesea Skerries Beacon. XXXI. Details of Covesea Skerries Beacon. XXXII. Elevations and Sections of Stone and Iron Beacons. XXXIII. Elevations of Buoys. ERRATA.