Walls: The walls of such buildings shall be constructed of concrete, brick, or stone, laid in cement mortar, and shall be not less than four inches thick, and shall extend into and below the surface of the surrounding ground not less than two feet, and shall extend above the ground sufficient height as to be not less than one foot above the floor level. All openings in such foundation walls shall be covered with metal grating having openings not greater than one-half inch between the gratings. Floors: The floors of stables and stalls shall be of concrete not less than three inches thick, upon which shall be laid a dressing not less than one-half inch thick of cement or stone, laid in cement mortar, or shall be constructed of floated concrete not less than four inches thick, in such way as to prevent ingress or egress of rats, and such floors to have a slope of one-eighth inch per foot to the gutter drain hereinafter provided for. Stalls: The floors of stalls may be of planking, fitting either tightly to the concrete floor or elevated not more than one-half inch from the stall floor, and so constructed as to be easily removable. Such removable planking shall be raised at least once a week, and the said planking and the concrete floor beneath thoroughly cleansed. Gutters: Semicircular or =V=-shaped gutters shall be constructed in such manner that a gutter shall be placed so as to receive all liquid matter from each stall, and each of these gutters to connect with the public sewer or with a main gutter of the same construction, which in turn shall be connected with the public sewer or public drain. All openings from drains into sewers shall be protected by a metal grating having openings not more than one-half inch between the gratings. Mangers: Each manger shall be constructed so as to have a slope of two inches toward the bottom, shall be covered with tin or zinc, and shall be at least eighteen inches deep, to avoid spilling of food. Feed bins: All feed bins shall be constructed of cement, stone, metal, or wood, and with close-fitting doors. If constructed of wood, the bins shall be lined or covered with metal, and the whole so constructed as to prevent the ingress or egress of rats. All grain, malt, and other animal food, except hay, stored or kept in any stable, must be kept in such feed bins. Said feed bins must be kept closed at all times, except when momentarily opened, to take food therefrom or when same are being filled. No feed shall be scattered about such bin or stable, and all such feed found on the floor or in the stalls of said stables shall be removed daily and placed in the manure pits. No foodstuffs intended for or susceptible of human consumption shall be kept or stored in any stable or any other place where animals are kept.