[7] The origin and the meaning of the term παραστάς is clear. A παραστάς is that which stands παρά a door or opening, i.e. a jamb. A passage in the inscription which gives specifications for Philon's Arsenal (I. G. II,^2 1054) is important in this connection. After prescribing the dimensions of the door of the arsenal, the material of the lintel, the inscription adds παραστάδας στήσας λίθου πεντεληικοῦ κ. τ. λ. The παραστάδες are clearly the door jambs which stand παρά the door. By an easy and simple extension the word came to designate not only the jamb but the wall of which the jamb was a part.