The building consists, above the basement floor, of a grand central nave, two side aisles, two main galleries, three transepts, and two wings. It will be remembered, that in Hyde Park an imposing effect was secured by the mere repetition of a column and a girder, which, although striking and simple, was certainly monotonous; and, moreover, in consequence of the great length of the building, the columns and girders succeeded one another so rapidly that the eye had no means of measuring the actual length. At Sydenham, pairs of columns and girders are advanced eight feet into the nave at every seventy-two feet, thus breaking the uniform straight line, and enabling the eye to measure and appreciate the distance. The building above the level of the floor is entirely of iron and glass, with the exception of a portion at the west front, which is panelled with wood. The whole length of the main building is 1,608 feet, and the wings 574 feet each, making a length of 2,756 feet, which with the 720 feet in the colonnade, leading from the railway station to the wings, gives a total length of 3,476 feet; or nearly three-quarters of a mile of ground covered with a transparent roof of glass. Visitors are fond of reverting to the old building in Hyde Park, and of comparing it with the present structure; in order to help the comparison, we furnish, side by side, the exact measurements of the two buildings; from which it will be seen that either building exceeds the other, in some of its proportions. CRYSTAL PALACE AT SYDENHAM. EXHIBITION BUILDING IN HYDE PARK. ft. in. ft. in. Length 1,608 0 Length 1,848 0 Greatest width 384 0 Greatest width 456 0 General width 312 0 General width 408 0 Area, including wings 603,072 0 Area 798,912 0 Height of nave from Height of nave from ground-floor 110 3 ground-floor 64 0 Height of central transept Height of transept from from ground-floor 174 3 ground-floor 102 2 Height of central transept from basement 197 10 Area of galleries 261,568 0 Area of galleries 233,856 0 Though not exactly in the direction of the cardinal points, the two ends of the building are generally called north and south, and the two fronts east and west.