4 OFFICIAL CATALOGUE. LIST OF ILLUSTRATIONS. Principal Entrance to the Industrial Palace—The South Portal .. .. Frontispiece. Colored Ground Plan of the Exhibition Facing page n Diagrams of Prize Medals .. .. .. .* •• • • •• ,, ’3 Tinted Plan of Space allotted to the United States in the Industrial Palace and Court Yard .. .. .. .. .. .. .. ,, 27 Ground Plan (in colors) of Fine Art Courts and Galleries .. .. ,, 90 Section of Rotunda .. .. .. .. •• •• •• •• >> ,z ^ Comparative Size of Domes .. .. .. .. .. .. .. » 126 By the courtesy of the Royal British Commission, this Catalogue contains several of the Plans and Fngravings specially prepared for the Official Catalogue of the British Section of the Vienna Exhibition.