[23] 



74 



Twenty-fonr sess-pnols, four feet in diameter and six feet deep, walled 

 up with dry stone, will be built under the difterent floors of ihe buildnjg. 



All the remaining mason work of every description, necessary to com- 

 plete the whole buildnig in the most perfect manner, will be performed by 

 the contractor. 



As it is the intention of the above specitication, with the plans, to cover 

 the entire and perfect completion of the work, no charge for extra work 

 will be allowed the contractor, unless caused by actual alterations of the 

 plans. And the contractor will be bound by the sum of ten thousand 

 dollars, to abide by the decision of the architect, whose decision in all 

 matters relating to the form, dimensions, and finish of all the parts of the 

 work, shall be final and conclusive. 



J. RKJN WICK, Jr., Architect. 



[Note. — Contractors will also estimate the difference in expense between 

 facing the building with rubble masonry, as hereinbefore specified, or of 

 setting the whole face with ashlar, varying in height of course from ten 

 to fourteen inches, and averaging eight inches in thickness, the ashlar 

 being furnished by the stonecutter.] 



Specification of the stone and cutting for the Smithsonian histitutioji. 



GENERAL DESCRIPTION OF STONE. 



The contractors will estimate on furnishing all the stone necessary for 

 the cutting and the expense of the cutting itself, and will furnish three 

 separate estimates of the above, based on white marble, buf!" colored sand- 

 stone of the best quality and uniform color, from the upper Potomac, and 

 granite of the same color and quality as that in the rear of the General 

 Post Office of the United States. 



CUTTING. 



North front porch — Will consist of three arched openings of the dimen- 

 sions shown on plans, in courses not exceeding 15 nor less than 12 

 inches rise. The jambs will each contain four rebates, filled each with a f 

 column on the exterior face, and one rebate, filled in like manner, 

 on the interior face. [See plan A, drawings No. 1.] All the columns 

 will have handsome moulded Norman plinths and bases and foilage caps. 

 The arches of each side will contain a similar number of mouldings to 

 the jambs, and each arch will be ornamented with a zigzag, battlement, 

 and cable, or other ornamented mouldings. 



The buttresses will be cut of similar courses to the doors, and bush- 

 hanmiered on the face, witli moulded caps and a double water table. Be- 

 tween the buttresses on all three sides a corbel course handsomely cut, and 

 eight to twelve inches projection of semicircular arches, resting on foliage 

 brackets, will be carried; and over the corbel course a label mould sup- 

 porting the battlement. The battlement will be well cut to the section 

 shown in No. 2, plan A. All the face work of the porch will be cut both 

 inside and outside. 



Front door. — Between the central front towers and under the porch a 

 door, of the dimensions shown on the plans, will be placed. The jambs 



