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The floors of the vestibules and central hall will be flagged with the oc- 

 tagon and square as above. 



All the joints of all the above flagging will be cut perfectly true, and 

 the tiles will be bedded on the best cement and sand -mortar. 



The floors of the rooms over the groined arches, in the central front 

 towers, will be flagged with best North river flag, as above described for 

 the cellars themselves, laid in the best cement and sand-mortar. 



Fire-proofing. — The floor of the chemical lecture-room, which occu- 

 pies the whole east wing, and the floors of the students' working labora- 

 tory, and the room above it in the east connecting range, each of which 

 is 38 by 24 feet in the clear, will be rendered fire-proof in the following 

 manner. Cast iron beams of the shape of the letter T reversed, whose 

 vertical arm will be 15 inches in depth, by 1^ inch in width, with a 

 bead on the upper end 2^ inches in diameter, and whose horizontal arm 

 will be eight inches long, and average 1^ inch in thickness, will be laid 

 four feet from centres ; the ends of these beams will run nine inches into 

 the walls, and will rest on a cast iron plate, 3 inches wide by 1 inch 

 in depth, which will be firmly anchored to the walls ; between these beams, 

 arches of brick five inches in depth will be turned to form the floors. 

 The spandrils over the arches will be filled in with a mixture of lime, sand, 

 and broken stone or gravel, over which a flooring of best North river flag, 

 well axed on the upper face, and not more than two inches thick, will be 

 laid in the best cement and sand-mortar. 



The floors of the rooms over the janitors' room and of the two rooms 

 in the towers, on a level with the museum, making in all four floors 16 feet 

 square, (exclusive of those over the groined arches in the cellars of the 

 front towers,) will be similarly fire-pruofed, unless they are groined with 

 brick as hereinbefore specified. 



The floor of the principal lecture-room will be tiled with best North 

 riverflag, laid on brick cross- walls, and well jointed and bedded in cement 

 and sand -mortar. 



A border of colored marble tiles four inches square, laid on bricks, in 

 cement or plaster of Paris, will be carried around the Regents' room, three 

 feet in width. 



^afe. — A fire-proof safe will be constructed in the small octagonal 

 tower, attached to the rear tower, with double wrought-iron doors, and 

 iron shelves and hollow brick casings, per directions of architect. 



A mantelpiece of red marble, or of such color as the architect shall 

 direct, and of the richest Norman pattern, having two columns on each 

 side, whose shafts will be a cable-mould and chevron, with plinths and 

 moulded bases, and foliage caps of the richest character; over the columns 

 a rich frieze, which will be ornamented by a band of Norman foliage, will be 

 carried, and over this a label mould filled with pateras or rosettes. Upon 

 this mould the shelf will be laid, which will be at least three inches 

 thick, and moulded in the front and ends. All the remaining parts of the 

 chimney will be completely finished in the best manner. The sides and 

 back of the fireplace wfll be laid up of best fire-brick, laid herring-bone 

 fashion. 



Dry walls of stone.— ThQ\Q will be four sinksorsess-pools, eight feet in 

 diameter and twelve feet deep, walled up in the best manner, with dry 

 stone, and placed in such positions as the architect shall direct. 



