Prominent in the section of the Netherlands, the name so descriptive of the land where not less than two hundred and twenty-three thousand acres are below the level of the sea and kept constantly drained by artificial means, are the engineering and mechanical devices for the reclamation and preservation of land, the formation of outlet-canals for the centres of commerce, and the bridging of the rivers and estuaries which intersect the maritime portions of the country. Some of the models and relief-maps were shown in the Netherlands section in the Main Building at Philadelphia, but the exhibition is more perfect here, as much has been added in the two intervening years. The works for the drainage of the Haarlemmer Meer illustrate the means employed for the last great drainage-work completed. This lake had an area of 45,230 acres, an average depth of seventeen feet below low water, and was drained between 1848 and 1853. Being diked to exclude the waters which naturally flowed into it, three large engines were built in different places around it, and the work of pumping out 800,000,000 tons of water commenced. The engines have cylinders of twelve feet diameter, and are capable of lifting 2,000,000 tons of water in twenty-four hours from the depth of seventeen feet to the level of the _boezem_, or catch-water basin, of the district. The boezem carries the water to the sea, into which it discharges by sluices at Katwyk on the North Sea and at Sparndam and Halfweg on the Y, or the southern end of the Zuyder Zee. The land reclaimed is now in excellent tillage, and one farm on the tract is referred to in agricultural journals as one of the three model farms of the world. The three engines are called the Leeghwater, the Cruquius and the Lynden, from three celebrated engineers who had at different times proposed plans for draining the Haarlemmer Meer. Proposals for its drainage were made by one of these engineers as far back as 1663. The next enterprise in hand is the drainage of the southern lobe of the Zuyder Zee, which is stated to have an average depth of thirteen feet, and it is intended to cut it off by a dike from the northern basin and erect sufficient engines around it to pump it out in thirteen years at the rate of a foot a year, working night and day.