Cyclopedia of architecture, carpentry, and building : a general reference work . wall wasintroduced as an additionalmethod of support. Possiblysomething of this feeling mayhave caused the use of the wallbetween the columns in the Mon-ument of Lysicrates, though fordifferent reasons. The plan ofthis monument being circular, itmay have been thought that theoverhanging projection of the en-tablature between the supporting columns would weaken the lintel,either actually or apparently, so that it might require additional sup-port at its point of greatest projection. But the difference between the u
Cyclopedia of architecture, carpentry, and building : a general reference work . wall wasintroduced as an additionalmethod of support. Possiblysomething of this feeling mayhave caused the use of the wallbetween the columns in the Mon-ument of Lysicrates, though fordifferent reasons. The plan ofthis monument being circular, itmay have been thought that theoverhanging projection of the en-tablature between the supporting columns would weaken the lintel,either actually or apparently, so that it might require additional sup-port at its point of greatest projection. But the difference between the use of the column in this fashion,attached to a plain curtain wall, and its use placed against the face of apier between arches, as the column was employed in the arcades of theTabularium and later in the Theater of Marcellus and the Colosseum,suggests a great advance in the architectural effectivenesss of its useand in its close identification with the more constructive architectureof the Romans, ^ven though there is but slight difference in the prin-ciple of its Fig. 100. A—Komau Pier. Engaged Column and Pier. 171 174 STUDY OF THE ORDERS But in any event, the column, as thus used by the Romans intheir architecture, can seldom be considered as an important struc-tural feature. It does not even act as a buttress to resist the thrustexerted upon the exterior walls by the interior arches roofing the roomsor corridors. The Romans must first have used a continuous and purely struc-tural arcade of arches turned against each other and resting on heav^-masonry piers, as in their acjueducts (Fig. 101 ). This undoubtedlyproved monotonous in effect; and so the colonnade was simply
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