Including galleries and the leather, fire and water suburbs, this structure affords more than fifteen acres of space. Over that area it rose like an exhalation in the spring and early summer of 1875. At the close of winter it existed only in the drawings of Messrs. Pettit & Wilson. Under the hands of Mr. Philip Quigley it was ready to shelter a great Fourth of July demonstration. This matches the rapidity of growth of its neighbor before described. The Main Building, designed by the same firm, had its foundations laid by Mr. R.J. Dobbins, contractor, in the fall of 1874, but nothing further could be done till the following spring. The first column was erected, an iron Maypole, on the first day of the month of flowers, and the last on the 27th of October. Three weeks later the last girder was in place. All had been done with the precision of machinery, no pillar varying half an inch from its line. Machinery, indeed, rolled the quadrant-shaped sections of each column and riveted their flanges together with hydraulic hammers; great steam-derricks dropped each on its appointed seat; and the main tasks of manual labor in either building were painting, glazing, floor-laying and erecting the ground-wall of masonry, from five to seven feet high, that fills in the outer columns all round to a level with the heads of theorists who, holding that _la propriété c'est le vol_, assert the propriety of theft. Following Belmont Avenue, the Appian Way of the Centennial, to the north-west, we penetrate a mob of edifices, fountains, restaurants, government offices, etc., and reach the Agricultural Building--the palace of the farmer. The hard fate of which he habitually complains--that of being thrust into a corner save when he is wanted for tax-paying purposes--does not forsake him here. The commission does not tax him, however, and the boreal region whereto he and his belongings are consigned is in no other way objectionable than as not being nearer the front. The building is worthy of a Centennial agricultural fair. Five hundred and forty by eight hundred and twenty feet, with ten acres and a quarter under roof, it equals the halls of a dozen State cattle-shows, The style is Gothic, the three transepts looking like those of as many cathedrals stripped of the roof, the extrados taking its place. The nave that spits them is a hundred and twenty-five feet wide, with an elevation of seventy-five feet. An ecclesiastical aspect is imparted by the great oriel over the main entrance, and the resemblance is aided by a central tower that suggests the "cymbals glorious swinging uproarious" in honor of the apotheosis of the plough. The materials of this bucolic temple are wood and glass. The contract price was $250,000. Its contents will be more cosmopolitan than could have been anticipated when it was planned. Germany claims five thousand feet and Spain six thousand. Among other countries, tropical America is fully represented.