II. Poem on Sir Ralph the Rover, extracted from Mr Southey’s Works. 438 III. Abstract Account of Light-house Duties. 439 IV. Reports relative to the Bell Rock Light-house, by Mr Rennie, and the Writer. 440-468 V. Remarks relative to the Ground-Swells of the Sea. 469-470 VI. Schedules of Materials and Workmanship. 471-474 VII. Abstract Account of Expence. Average Price Provisions. 475-483 DESCRIPTION OF PLATES. Plate I. Inchkeith Light-house. 487 II. Carr Rock Beacon. 487-489 III. Chart of Great Britain, with Sections of the Depths of the Sea. 490 IV. Chart, shewing the position of the Bell Rock, in relation to the opposite Shores. 490 V. Chart, shewing the Position of the Rock, in relation to the Shipping. 491 VI. Plan of the Rock, shewing the Position of the Light-house. 492-499 VII. Original Designs for the Light-house. 499-501 VIII. Beacon House. 501-503 XI. Progress of the Works. 503-505 X. Implement and Apparatus connected with the Work. 505-508 XI. Sheer-crane, Praam-boat discharging, &c. 508-510 XII. Work-yard, Light-Keepers’ Houses at Arbroath. 511 XIII. Plan of the several Courses of the Masonry of the Light-house. 511-515 XIV. Moveable Beam Crane. 515-517 XV. Foundation-Pit of the Light-house. 518 XVI. Elevation and Section of the Light-house. 518-519 XVII. Balance-Crane. 520-522 XVIII. General View of the Works. (See page 424.) 520-523 XIX. Door and Window Hinges, and Thunder-rod. 523-525 XX. Balcony and Light-Room. 526-529 XXI. Frontispiece explained. (See Title-page.) 529 XXII. Vignette on Second Title-page. (See page 62.) 530 XXIII. Design for a Light-house, suggested on visiting the Wolf Rock, 530-533 INTRODUCTION. ACCOUNT OF THE INSTITUTION OF THE BOARD OF COMMISSIONERS AND OF THE PROGRESS MADE IN THE ERECTION OF THE NORTHERN LIGHT-HOUSES. [Sidenote: Institution of Board of Northern Light-houses.]