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GENERAL REPORT OF THE JUDGES OF GROUP XXVI. 5 the galleries located at either end, and is accompanied by two others ; each 100 feet in width, with intervening and outside aisles respectively 48 and 24 feet wide. Similar naves, with intervening aisles, cross the building in the middle. Iron columns, placed 24 feet apart length wise of the building', support the wrought-iron trusses of the roof, which is covered with tin. The flooring is of plank laid on sleepers resting directly on the ground, with no open space beneath, a precau tion against fire,—a complete system of water-supply and drainage being also provided for protection against such a contingency and for sanitary purposes. The sides of the building are filled in between the columns with brick-work to the height of seven feet, with glazed sash above, a portion of which are movable for ventilation. Louvre ven tilators are also introduced over the main naves, together with sky lights. The general effect of the building is satisfactory, considering its temporary character and the consequent imposed restriction as to cost, and also in view of the materials used,—glass and iron. It should be here stated that the columns and trusses are so designed as to enable them to be taken down and used elsewhere. As might be expected, there is a total absence of anything like monumental grandeur or even apparent substantiality about the building. A certain stiffness and stringy monotony pervades the whole structure, while the relative height as compared to the vast area covered pro duces a squatty appearance. The fagades, with their central features and corner towers connected by lower galleries in front of the main walls, are somewhat relieved of their monotony by pleasing effects of light and shade. The central portion, carried up with its towers, forms an appropriate crowning to the general mass. The interior is light and pleasing, but wanting in effect and variety. The spectator, taking in, as he does, at a glance the entire space, fails to appreciate the ex tent and vastness of the ensemble. The ground-plan of the Paris Exhibition of 1867, with its concentric oval naves and radiating aisles, presenting an ever-changing variety, was far more satisfactory in this respect, besides being better adapted for the classification of the various exhibits, either in groups or as national exhibits. The abandonment of any similar plan is to be attributed to the great loss necessarily sustained, as the mass of the materials, at Paris, when taken down, could be put to no practical use. MACHINERY HALL. Machinery Hall, also a parallelogram in form, is 1402 feet long and 360 feet wide, and covers an area of about 14 acres. It was erected in nine months, at a cost of $542,300. Two main avenues 90 feet wide,