e is no proof. What survives consists
of two bays next the crossing, the lower portions of which are in
the Norman style. A unique arrangement is visible here, as far as
Scotland is concerned, and resembles a somewhat similar design at
Gloucester Cathedral and Romsey Church, Hampshire. The main piers
have the peculiarity of being carried up as massive cylindrical
columns to the arch over the triforium. The lower story has the
round arch and vaulting ribs supported on corbels, projected from
the round face of the piers. The triforium arch is round and
moulded, and has a well-wrought chevron ornament. "It rests on large
caps of the divided cushion pattern. The main arch is formed into
two openings by a central round shaft and two half round responds,
with massive cushion caps carrying plain arches."[325]

The clerestory is of Transition work, having one lofty stilted and
pointed arch, and two smaller pointed arches in each bay. When the
Transitional clerestory was erected, the eastern part of the choir
is thought to have been built, and the remains of two lofty pointed
windows are preserved to the east of the cylindrical piers. The same
Norman style of architecture as in the choir is continued in the
south and north transepts, and appears to have originally also
extended into the nave. "This is apparent from the mode in which the
string-course over the triforium runs along on the north side from
the choir to the nave, where it is broken off. That the Norman nave
has probably extended westwards from the crossing is further
evidenced by the existence of the west end wall, with its great
doorway and windows, and the south doorway to the cloister, which
portions are all of characteristic Norman design." The Norman work
must have preceded the Transition work in choir and nave by a
considerable portion of time. There is no gradual development
visible.

The nave (129 feet in length and 27-1/2 feet in breadth) "is divided
into nine bays, each of which comprises a main arch resting on
clustered piers, a triforium with one round arch containing two
pointed arches, and a clerestory forming a continuous arcade, with
four pointed arches in each bay. The main clustered piers contain
four principal shafts at the angles, and four intermediate shafts
between them. The former are brought to a poin