50. Memorandum on General Arrangements and intended Mode of Proceeding in the Launching Operations (October 30, 1857).....356 51. Letter to the Directors of the Eastern Steam Navigation Company on the State of the Operations (November 26, 1857).....366 52. Letter to the Directors, and Memorandum on the State of the Operations (December 17, 1857).....377 53. Letter to W. Froude, Esq., describing the Floating of the ‘Great Eastern’ (February 2, 1858).....389 54. Extract from Report to the Directors of the Bristol Dock Company on the Condition of the Floating Harbour (August 31, 1832).....423 55. Extract from Report on the same subject (January 31, 1842).....424 56. Extract from Report on Portishead Pier (December 26, 1839).....427 57. Letter on the Distribution of Prizes, addressed to the Chairman of the Committee of the Section of Machinery of the Exhibition of 1851 (March 11, 1850).....445 58. Extract from Report of the Jury of Class VII. of the Exhibition of 1851 on Sir Joseph Paxton’s Design for the Building.....447 59, 60, 61. Letters to Westley Richards, Esq., on the Polygonal Rifle (October 25, 1852; February 7, 1853; November 26, 1858).....450-1 62. Extract from Letter to James Nasmyth, Esq., on the Construction of Large Guns (April 2, 1855).....452 63. Extract from Letter to W. G. Armstrong, Esq., on the Wire Gun (June 8, 1855).....454 64. Memorandum on the Floating Gun-Carriage (December 20, 1855).....455 The principle is fixing a very heavy gun in a floating shot-proof chamber (p. 455)--Mode of working the gun (p. 455)--Mode of manœuvring the vessel (p. 456)--Mode of attacking the Baltic forts with a fleet of such vessels (p. 457)--Thickness of iron required to make the vessel shot proof (p. 458)--Best manner of constructing the vessels (p. 458). 65. Letter to the Secretary of the Admiralty on the Floating Gun-Carriage (July 27, 1855).....459 66. Memorandum on Renkioi Hospital Buildings (March 1855).....463 Necessary conditions in designing these buildings (p. 463)--General description of them (p. 463)--Closets and lavatories (p. 464)--External and internal covering (p. 464)--Ventilation (p. 464)--Kitchens (p. 465)--Drainage (p. 466)--Officers’ quarters (p. 466)--Transport of materials (p. 466)--Portable baths (p. 467)--Cost of buildings (p. 467). 67. Letter on the Direction of Railway Works (March 4, 1845).....475 68. Letter on the Position of Joint Engineer (October 16, 1843).....476 69. Letter on the Position of Consulting Engineer (December 30, 1851).....477 70. Letter on the Position of the Engineer in relation to the Contractors (May 26, 1854).....477 71, 72, 73. Extracts from Letters on the Relations between the Engineer and the Directors (April 15, 1850; December 6, 1851; Jan. 22, 1857).....478-481 74, 75, 76. Extracts from Letters on Interference of Directors with the Assistant Engineers (January 19, 1842; January 28, 1842; December 12, 1851).....481-3 77. Extract from Diary (May 5, 1846).....485