_The Improved Wood Pavement Company._--The ground being consolidated, a layer of sand is made the basis of the pavement, and assumes the shape the surface of the street is intended to take. Red-wood boards 1-inch in thickness are then laid across the roadway, from kerb to kerb, placed together so as to break joint; boards of the same material and thickness are then laid longitudinally, and breaking joint in the same manner.[69] On this foundation red-wood blocks are placed in rows, taking the same direction as the under flooring. Between each row of blocks, a strip of wood ³⁄₄ × ³⁄₄ inch is nailed to the block and flooring, the blocks in all cases breaking joint; the spaces thus formed between the rows of blocks are then run with a thick composition which fills all vacant spaces there may be between the strip and the block, covering the strip about ¹⁄₈ of an inch. Gravel, dried and sifted through ³⁄₄-inch mesh, is then put in, solidly rammed, and composition poured in; the pavement is then covered to a depth of ¹⁄₂ an inch with dried gravel and composition for the purpose of indurating the surface, and filling the spaces flush with the top of the block, a slight covering of sand is then spread, when the traffic may immediately pass over. _The Asphaltic Wood Pavement Company._--After the ground is properly prepared, 6 or 9 inches of concrete is laid, on this is laid a bed of asphalte not less than ¹⁄₂-inch in thickness; then wood blocks 3 by 8 by 5 inches or 3 by 9 by 5 inches, of good, sound, yellow Baltic timber are laid with joints ¹⁄₂-inch in width, these joints are filled from 2 inches up with heated asphalte, the remaining 3 inches being filled with a grouting of hydraulic lime, and clean, sharp, fine river grit or sand, the whole being covered with a top dressing of fine, sharp sand, which wears in with the traffic. _Croskey’s Wood Pavement._--Upon a bed of concrete, cross grained planks were to be placed side by side and be forced together by pressure so as to form a compact homogeneous surface of wood.[70] _Lloyd’s Patent Keyed Wood Pavement._--The special feature of this system is that _Pitch Pine_ blocks are used laid _direct_ upon the concrete foundation, the blocks being grooved on each side so that the grouting (composed of Portland cement) shall run in and form a key. _Harrison’s Wood Pavement._--This system consists of a concrete foundation, upon which strips of wood 2 inches wide by ¹⁄₂ an inch in thickness are laid. Upon these, wood blocks 3 inches in breadth are placed, and then hot asphalte is poured into the joints, which conglomerates the whole. _Henson’s Wood Pavement._--The main feature of this patent consists in placing common felt on the concrete bed, and between the joints of the wood blocks; thus, it is contended, giving elasticity and allowing for the expansion and contraction of the blocks. The blocks are also bevelled on the top and grooved in a particular manner.