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6 INTERNATIONAL EXHIBITION, 1S76. 70 feet high, and 1360 feet long (the distance between the galleries occupying the ends of the building) are accompanied by one inter vening and two side aisles each 60 feet wide and 40 feet high. A transept 90 feet wide crosses in the middle of the building and extends beyond the main hall; this is flanked by aisles 60 feet wide, and forms an annex for hydraulic machinery. On account of the great similarity in plan between this and the Main Building, the effect produced is much the same. The interior of Machinery Hall, however, appears more substantial, due in part to the use of wood in its construc tion ; while great praise is due to the admirable arrangement of the Hydraulic Annex, which forms so marked a feature. AGRICULTURAL HALL. Agricultural Hall was erected in about eight months, at a cost of $260,000, and is 820 feet long, 540 feet wide, and covers an area o.f over 10 acres. The main nave is crossed at intervals and at right angles by three similar ones, all constructed of Howe-truss arches of Gothic form; the spaces between these naves, which occur at the four corners of the building also, form, as it were, so many covered courts. The disposition of this building is well adapted to its pur poses, and it owes much of the effectiveness of its interior to its grand arches springing directly from the ground,—a very satisfactory feature, contrasting favorably with the stilted and rather unstable appearance of the perpendicular supports employed in the two buildings just alluded to. The United States Government Building, with its naves and aisles in the form of a Latin cross, and the Women’s Pavilion, in the form of a Greek cross, with accompanying corner courts at the angles, respectively cover an area of 102,840 square feet and 26,368 square feet. These constructions are of wood, and effective in their appear ance. This is particularly due to their disposition in ground-plan, which represent types so familiar to us all. Among the minor temporary structures worthy of passing notice are a United States Post Hospital and an Ordnance Laboratory Build ing. This latter structure consists of a wrought-iron frame riveted together, and is covered with a light wood casing. In the event of an explosion only the roof and sides would be carried away, while the frame would stand to protect the inmates against injury from falling materials. A peculiar feature to be observed in the Art Annex Building is the communication between the numerous rooms, which is provided for