building, within the walls of Dover
Castle, and in many other remains of
Roman structures in England.
Butment, a supporter, or prop, on or
against which the feet of arches rest.
Buttress, a kind of butment, built some-
times archwise, as to Gothic buildings ;
a mass of stone or brick work, serving
to prop or support buildings, walls, &C-.
on the outside, where their great height
or weight require additional strength,
Caliducts, pipes or canals, disposed in
or along the walls of houses, for convey-
ing hot air to distant apartments, from
a common or cental furnace, as prac-
tised by the ancients.—This method has
been adopted in modern buildings, with
success and ceconomy.
Canopum, aTempleto the Egyptian God
Canopus, which from the story related by
Suidas, represented the element water.
Capital, the uppermost member of a
column, which is as a crown or head
thereto, placed immediately over the
shaft, and under the architrave ; no co-