Quantity. Lumber (feet b. m.) 450,000,000 Roofing paper (square feet) 76,000,000 Doors 140,000 Window sash 700,000 Wall board (square feet) 29,500,000 Shower heads 40,000 Water-closet bowls 54,000 Tank heaters and tanks 11,000 Heating boilers 1,800 Radiation (square feet) 4,200,000 Cannon stoves 20,000 Room heaters 20,000 Kitchen stoves and ranges 10,000 Wood pipe for water supply (feet) 1,000,000 Cast-iron supply pipe (feet) 470,000 Wire, all kinds and sizes (miles) 5,500 Wood tanks (aggregate capacity) 8,300,000 Hose carts 600 Fire engines 90 Fire extinguishers 4,700 Fire hose (feet) 392,500 Fire hydrants 3,600 Hand-pump tanks 12,700 Fire pails 163,000 Cots 721,000 Sixteen National Army camps were constructed in various parts of the United States at points selected by the War Department. The camps were carefully laid out by experienced town planners and engineers to give best results considering all viewpoints. [Sidenote: Extent of a typical National Army cantonment.] [Sidenote: Roads constructed and improvements installed.] A typical cantonment city will house 40,000 men. Each barrack building will house 150 men and provide 500 cubic feet of air space per man. Such a cantonment complete contains between 1,000 and 1,200 buildings and covers about 2,000 acres. In addition, each cantonment has a rifle range, drill, parade, and maneuver grounds of about 2,000 acres. In many cases all or a large part of the entire site had to be cleared of woods and stumps. The various military units were located on principal or primary roads--a regiment being treated as a primary unit. About 25 miles of roads were constructed at each cantonment, and sewers, water supply, lighting facilities, and other improvements installed. [Sidenote: The special buildings required.] An infantry regiment requires 22 barrack buildings, 6 for officers' quarters, 2 storehouses, 1 infirmary building, 28 lavatories, with hot and cold shower baths, or a total of 59 buildings. In addition to the buildings necessary for the regimental units, each cantonment has buildings for divisional headquarters, quartermaster depots, laundry receiving and distributing stations, base hospitals having 1,000 beds, post exchanges, and other buildings for general use. [Sidenote: Remount stations.]