That each Slaughter-house be drained by a glazed pipe drain, not less than six inches in diameter, set in concrete and jointed in cement, or otherwise made impermeable, and communicating directly with the public sewer. That the gully at the inlet to the drain be trapped with a stoneware syphon-trap, or other trap of approved material and construction, and be covered with a grating, the bars of which shall not be more than three-eighths of an inch apart; the grating to be fastened with a lock and key, and kept at all times locked, unless opened for cleansing or repair. OBJECTION. _That “it is very doubtful whether setting the drain pipes in cement, whereby they cannot be got at, except by great breakage and disturbance, is at all advantageous.”_ REPLY. The advantages claimed for setting the drain pipes in, and upon cement, are durability and strength; and if a pipe of six inches diameter be used, there is but little liability of its becoming choked or requiring repair for many years. Drain pipes laid on soft subsoil materials frequently break asunder from the subsidence of such a matrix, or from heavy weights falling suddenly upon them, from above, and our daily sanitary work furnishes abundant evidence of the danger to health arising from the fracture of drain pipes, where originally placed upon improper ground, and especially when under such circumstances they are subjected to violent blows. In Edinburgh the Slaughter-houses are “laid with a thick well-dressed pavement, resting on a stratum of concrete twelve inches thick.” BYE-LAW IV. That each Slaughter-house be provided with adequate cisternage and water supply, or, where practicable, with a _constant_ supply of water, and such arrangement of pipes as will enable the pavement and the walls to the height of 7 feet 6 inches to be conveniently and quickly washed. OBJECTION. _The Butchers urge that_ four _feet is sufficiently high for the washing of the walls._ REPLY. The necessity for this alteration will be dealt with under remarks upon Bye-law No. 6. BYE-LAW V. That each Slaughter-house be separated from any adjoining Slaughter-house in a different occupation by a brick wall, of at least nine inches in thickness, extending from the ground to the roof, so as effectually to shut off all atmospheric communication between it and the adjacent Slaughter-house. OBJECTIONS. _The Butchers object to the brick side walls between adjoining Slaughter-houses being more than six or seven feet high, above which they would have placed “the largest possible openings, fitted with louvre boards.” They are of opinion “that the best construction in the case of a row of Slaughter-houses would be, that there should exist means of thorough ventilation from end to end and side to side.”_ REPLY.