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A Roman Outpost on Tweedside 181
ran across the interior from one gateway to another. The spaces
between these streets were occupied by ranges of stone buildings,
the chief of which was the Principia, better known in Scotland
as the Pretorium, an imposing erection 131 feet by 104 feet
the largest of its kind known in Britain. It had a court in
front 70 feet by 62 feet, open above, and surrounded on three
sides by an ambulatory 10 feet wide, the roof of which was
supported on pillars. In front of the court was an entrance
hall of greater length than the width of the court and extending
^
PLAN OF EARLY FORT.
into the street in front a unique feature in Britain. In a
range of five rooms at the back of the building, fronting to
the inner court, the one in the centre contained a sacellum,
probably for the standards and the sacred emblems.
Close it by was a well 25 feet deep, the upper part of which was
filled with building stones, among which was part
of an inscribed
tablet ; at 8 feet down was a human skeleton, apparently of
a woman, judging from the two brooches that lay near it ; at
12 feet down an altar, dedicated to Jupiter, and a brass coin of
Hadrian ; from this to 22 feet a medley of bones of animals,
deer-horns, skulls of oxen and horses, mingled
with broken.