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3�4 � with cells vertical shall be not less than twelve huOdred (1,200) pounds per square inch; the average for concrete blocks laid with cells vertical shall be not less than eight hundred ( 800) pounds per square inch, concrete blocks shall be not more than thirty -8j, (36) days old when tested. The average strength of the blocks as here given shall be obtained by testing ten blocks of average quality. (m) The allowable working stress of hollow building blocks shall not exceed one hundred twenty (120) pounds per square inch of groes area for terra cotta blocks or eighty (80) pounds per square inch of grass area for concrete blocks. if, wall be built of blocks with the cells horizontal, the allowable working stress shall not exceed thirty (30) pounds per square inch of ;rose area. (n) All walls and partitions in schoils, hospitals and places of public assemblage, over one story high, and all walls and partitions in theatres, Shall here- after be built of brick, stone, hoklow or solid blocks, or metal lath and Portland Cement plaster on metal studding, or other equivalent incombustible construction. Section 14. Concrete construction. Concrete for reinforced concrete construction shall consist of a wet mixture of one part of Portland Cement to not more than six parts of aggregate, fine and coarse, in Stich proportions as to produce the greatest density. The gnglity of the materials, the design, and the construction shall be in accordance with the best engineering practice. Section 16, Protection of ends of Wooden beams. The ends of all floor, ceiling, or roof beams, entering a party or fire wall from opposite sides, small be r3eparated by at least six (6) inches of solid masonry. Such separation may be obtained by corbeling the wall, or staggering the beams, or the beams may be supported by steel wall hangers, but, no wall shall be corbeled more than two (2) inches for this purposes The ends of all wooden beams which enter walls shall be out to a bevel to make them self -releasing. Sea. 16. Protection of wall openings. (a) If the opening be in a party of fire wall it shall have a standard automatic fire door on eadh side of the wall. If an opening in a fire wall is made to serve 4s an emergency exit, it shall not exceed forty eight (48) square feet in area, and a self-closing door shall be substituted for one of the automatic fire doors. (b) Every building within the congested fire limits, except churches, hotels, dwellings, apartment houses, tenement houses, dormitiories, and lodging houses, shall have standard fire doors, shutters, or wired glass in incombustible frames and sash on every exterior opening above thethird story, except when fronting on a street not less than thirty (30) feet wide, or Where no other building is within thirty (30) feet of such opining. The Wall of a building in the same plane as that in which the opening is situated, shall not be considered as coming within the intent of this rule. All openings in the side and rear walls of the first story, except show windows, shall be protected as prescribed in this section when within thirty (30) feet of another buildings (c) All exgerior windows more than one hundred (100) feet above the curb shall have incombustible frames and sash glazed with wired glass if within thirty (30) feet of adjacent building. (d) Occupants of bus dings shall close all exterior and interior fire doors fire shutters, and fire windows at the close of bubiness each day. Sea. 17. Stairway and elevator shafts. I