Temporary Barrack on Rock -- Tools and machinery -- Steam Tender for the works -- Employment and wages of workmen -- Progress of the outfit for the season’s operations -- Embark for Skerryvore -- Lay down moorings, and try to land on the Rock -- Driven to Mull -- First day’s work on the Rock -- Shipment of materials at Glasgow and Greenock -- Reach Tyree -- Driven to Mull -- Return to Tyree -- First good day’s work on the Rock -- Sudden gale and great peril to the vessels -- Reach Hynish in safety -- Detained by bad weather four days at Hynish -- Return to the Rock and have six days of good weather -- Erection of the pyramid of the wooden barrack -- Mode of determining the length of the beams, and the sites for their fixtures -- Pyramid completed -- Mode of living while erecting the barrack -- Shoals of Medusæ seen -- Driven by a gale to Mull -- Return to Hynish and are driven to Coll -- Return to the Rock -- Driven to Tyree -- Return to the Rock -- Horizontal braces fixed -- Driven to Mull -- Heavy gale -- Timber cast on Tyree -- Return to Rock and further progress of barrack -- Last day’s work on Rock this season -- Precaution for the benefit of shipwrecked seamen -- View from top of pyramid -- Destruction of the barrack during a gale -- Letter from Mr Hogben -- Proceed to Skerryvore -- State in which the Rock was found -- Cause of the destruction of the barrack -- Preparations for a new barrack -- Works at Hynish -- Hynish quarries, 71 CHAPTER V. OPERATIONS OF 1839. Shipping station and pier at Hynish -- Granite quarries in Mull -- Observations on the quarrying of granite -- Dressing of the Lighthouse blocks -- Excavation of foundation for the Lighthouse Tower on the Skerryvore Rock -- Fitting up of the second barrack on the Rock -- Sudden death of George Middlemiss -- Wharf and landing-place on the Rock -- Ring-bolts, water-tanks, and railways -- Incidents of the season -- Effects of a gale from the south-west -- Mutiny of the crew -- Near approach of the vessels to the Rock, and other circumstances shewing the importance of a Light on the Skerryvore, 107 CHAPTER VI. OPERATIONS OF 1840. Hynish workyard -- Hynish pier -- The Rock -- Life in the barrack -- Foundation-pit -- Landing of the materials on the Rock -- Laying the first stone, 140 CHAPTER VII. OPERATIONS OF 1841. Hynish workyard -- The Rock -- The waves -- Colours of the breaking waves -- The seals, 151 CHAPTER VIII. OPERATIONS OF 1842. State of the Rock in Spring of 1842 -- Commencement of Rock operations -- Last stone -- The Lantern, 163 CHAPTER IX. CONCLUDING OPERATIONS AND EXHIBITION OF THE LIGHT.