Eastern District Penitentiary of Pennsylvania, 
located at Fairmount Avenue and Twenty-first Street 
in Philadelphia, where Cowperwood was now to serve his 
sentence of four years and six months, was a large, gray- 
stone structure or wall and inclosed prison ten acres in 
extent—solemn and momentous in its mien, not at all 
unlike the palace of the Sforzas at Milan, although not so 
distinguished. It stretched its gray length for several 
blocks along four different streets, and looked as lonely 
and forbidding as a prison should. The wall which 
inclosed its great acreage and gave it so much of its 
solemn dignity was thirty-five feet high and some seven 
feet thick. The prison proper, which was not visible from 
the outside, consisted of seven arms or corridors, ranged 
octopus-like around a central room or court, and occupy- 
ing in their sprawling length about two-thirds of the 
ten-acre yard inclosed within the walls, so that there was 
but little space for the charm of lawn or sward. The 
corridors, forty-two feet wide from outer wall to outer wall, 
were one hundred and eighty feet in length, and in four 
instances two stories high, and extended in their long reach 
in every direction. There were no windows in the corridors, 
only narrow slits of skylights, three and one-half feet 
long by perhaps eight inches wide, let in the roof ; and 
the ground-floor cells were accompanied in some instances 
by a small yard ten by sixteen—the same size as the cells 
proper—which was surrounded by a high brick wall in 
every instance. The cells and floors and roofs were made 
of stone, and the corridors, which were only ten feet 
wide between the cells, and in the case of the single-story