Figure 37. — Cellar of Structure B, showing remains of original cross wall 

 at left and added cross wall at right. Mercer probably referred to the latter 

 in 1749 in his account with Thomas Barry: ''Underpinning and altering 

 th<- cellar." 



As described aboN-e, this cross vvhII was found to be 

 tied into the brick pavement that abutted it on the 

 south side. 



The bricks in the main foundation walls and in the 

 partly destroyed cross wall and pa\emcnt, on the basis 

 of sample measurements, show a usual dimension of 

 about 8% by 2% by 4 inches. .An occasional 9-inch 

 brick occurs— about 10 percent of the sample. 



In contrast, the bricks in the second cross wall are 

 all 9 inches long, except two that are 8,'.^ inches and 

 one that is 8% inches. Similar sizes prevail in the 

 '►'•-'icks exposed in the "portico" foundation (Wall C) 



at the soutii end. The significance of these brick 

 sizes will be discussed later. 



It is clear that Wall C was the foundation of tlie 

 "portico," and that by "■portico"" the \\riter of the 

 insurance policy meant \ eranda or loggia. The policy 

 also shows a "Porch 10 by 5 f." extending from the 

 middle of the \eranda. The highway now covers 

 this spot. 



In the space between the two parallel cross walls 

 within the main foundation, the debris yielded a large 

 section of a hea\y, red-sandstone arch, 14 inches wide, 

 9 inches thick, and 3 feet 2 inches long. This arch 



