NATURAL HISTORY BUILDING 29 



course, is a single stone. Above the two lower courses to the water 

 table the stone is cut with rusticated horizontal and arch stone joints, 

 the raised faces, except that of the projecting keystone of the arches, 

 having a picked surface. Measured over the raised surfaces only, 

 the four courses above the two lower ones are all approximately of 

 the same width. The water table presents a plain vertical edge 2 feet 

 3 inches thick. 



All granite work is at least 10 inches thick, but courses and in- 

 dividual stones exceed this thickness in varying degree in order to 

 insure proper binding with the brick backing. Stones entering into 

 the construction of window and door jambs, heads, etc., extend back 

 into the reveals far enough to enable the inner edges to be covered 

 by the window and door finish. The reveals, however, do not run 

 through flush the entire thickness of the stone work, being broken by 

 minor reveals. The total thickness of the walls to the outer face of 

 the rustication is 5 feet 4 inches in the wings and 3 feet 8 inches in 

 the ranges. 



The typical window openings of the ground story are 10 feet wide 

 and 10 feet 6 inches high to the crown of the low segmental arch. 

 The width of the intervening piers is 8 feet 6 inches. The openings 

 for the wagon doors at the outer ends of the east and west wings 

 have the same width as the windows but are 15 feet 10 inches high 

 from the pavement. The piers at these two ends have an extra brick 

 backing which increases their thickness. 



First and second stories. — The granite work of these stories is 

 treated throughout as though for a single story. The combined 

 height of the stories, which begin on top of the water table course 

 and extend to about the middle of the main course of stone of the 

 main cornice, is 42 feet 6 inches. The sill or plinth course of the first 

 story, which is 3 feet 11 inches high (this being also the height of 

 the sill above the floor in the inside of the building) , carries around 

 the entire building as a strong horizontal line, and all pilaster bases, 

 plinth blocks, etc., are above it. Below the window openings this 

 height is occupied by two stones, the upper, a sill stone 1 foot high, 

 and the lower, a sub-sill or facia stone. In the east and west wings 

 this lower stone is cut with a slightly raised panel, flanked on either 

 side by simple brackets in low relief. From the sill line the window 

 openings and intervening piers of the wings extend continuously and 

 uniformly to the lower edge of the entablature of which the main 

 cornice is a part, a distance of 31 feet 10 inches. In the ranges, how- 

 ever, the height of these openings is reduced to 31 feet 6 inches by a 

 shallow 4-inch reveal which extends across the openings below the 

 entablature. The division of the window space between the two 

 stories is marked by a galvanized iron panel at the level of the second 

 story floor. 



