31. These entrances are defined by short white-painted columns with decorative composite capitals supporting an embellished semi-circular arch . 32. The semi-circular arch which rises from the abacus has the same serried planes and circular mouldings as the jambs. 33. The ground floor, carries semi circular arches in contrast to the squared openings on the basement and first floor levels. 34. One incontrovertible rule governed all Ancient Roman architecture a semi-circular arch is exactly twice as wide as it is high. 35. The main entrance to the station is through a covered stone porch framed by three semi-circular arches supported by columns. 36. The fenestration at the west facade is similar to that at the main, except with circular arches at the upper level. 37. In the facades of St Denis, Chartres, Mantes, Laon and Paris, the rose was put under a circular arch . 38. The doors have drips over them, and the two into the front apartment have semi-circular arches , the others lintels. 39. The entrance is at the east end and is formed by a semi-circular arch with stepped windows above that light the stairwell. 40. A projecting, one-storey, cubical reception section provides access to the nave through a semi-circular arch with iron grillework.
