69 ^ [23] 



octagon, and two feet in the fourth story, which will be backed in with 

 good hard brick, exclusive of all projections. 



The thickness of the walls of the" central rear tower will be three feet in 

 the first story, two feet six inches in the second story, and two feet in the 

 third story, exclusive of all projections. 



The thickness of the walls of the campanile, exclusive of all projec- 

 tions, will be two feet to the line of the roof of the main building, and 

 above this line twenty inches, and backed in with best hard brick. 



The thickness of the walls of the octagonal tower will be two feet three 

 inches to the line of the roof, and twenty inches above the line of the roof, 

 and backed in with brick, exclusive of the batter at the base and all pro- 

 jections. 



The thickness of the walls of the remaining towers will be two feet on« 

 an average, exclusive of all projections, and the stories above the roofs 

 will be backed in with brick. 



All the remaining walls, if any, to be in no case less than two feet thick, 

 and to be executed by the contractor. 



All the thicknesses above given are exclusive of the brick lining wall. 



Brick masouri/. — All the partition walls which rise above the basement 

 will be two bricks — say 18 inches in thickness — to the height of the floor 

 of the second story, and one and a half brick — say 14 inches in thick- 

 ness — from thence to the under side of the rafters of the roof. Arches for 

 doors and windows will be turned, of such sizes and in such places as may 

 be directed by the architect. 



All the interior arches behind the window arches, door arches, &c., 

 will be turned in such manner as architect shall direct, to the form of Nor- 

 man jambs, to receive the plaster of the jambs. Trimmer arches of brick, 

 nine inches thick, will be turned for all the hot-air and furnace flues in all 

 the floors. 



The arches over the pillars supporting the clerestory of the gallery of 

 art, in the west connecting range, will be of best hard brick, laid to such 

 form as the architect shall direct, and over them a brick wall eighteen 

 inches thick will be carried up to the level of the under side of the roof of 

 the side aisles. 



Groined arches of brick, eight inches thick, will bo turned in the most 

 perfect manner for the ceilings of the mezzanine and upper story of the 

 porter's apartments, which will be situated in the lower central front 

 tower; they will be filled in with spandrils and haunch walls, supporting 

 flag floors of JNorth river flag. If preferred by the contractor, the iron 

 beams, with brick arches between them, hereinafter described, may be 

 used in place of the above groined arches. 



All the remaining brick-work necessary to complete the building to be 

 performed by the contractor, whether specified or not. 



Ciit-stom masoivry. — All the cut-stone rnasonrv, of every description, 

 which will be found in the specification of tlie stone and cutting, will be 

 set by the mason in the most true, perfect, and substantial manner; and 

 nil the iron dowels, clamps, anchors, rods, (fcc.^ necessary to secure and 

 render perfect the stone work, will be furnished by the mason; and the 

 joints of the cut-stone masonry will be pointed in the same manner as 

 above described for the face of building. 



Mortar.— h\\ the mortar for ail the above brick, stone, and cut-stone 

 masonry, to be composed of the best hydraulic or ground lime, or of a 



