ABA A ADY.
Abacus, the upper member of a column,
which serves as a covering to the capital.
To the Tuscan, Doric and ancient Ionic,
it is square; to the modern Ionic, Co-
rinthian and Composite, each side is
arched, or cut inwards, and is decorated
in the centre with a flower or other or-
nament. See Plates 9, 10.
Acanthus, a plant, whose leaves form
an ornament in the Corinthian and
Composite capitals, and are said to
have originally given rise to the former
Acroteria, a kind of base, placed on
the angles of pediments, usually for the
support of statues, &c.
Adytum, a sacred place in a temple,
where none but priests were allowed to