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_aerial_ cupola, is entitled to the praise of bold design and skilful execution. The dome of St. Sophia, illuminated by four-and-twenty windows, is formed with so small a curve, that the depth is equal only to one sixth of its diameter; the measure of that diameter is one hundred and fifteen feet, and the lofty centre, where a crescent has supplanted the cross, rises to the perpendicular height of one hundred and eighty feet above the pavement. The circle which encompasses the dome, lightly reposes on four strong arches, and their weight is firmly supported by four massy piles, whose strength is assisted, on the northern and southern sides, by four columns of Egyptian granite. A Greek cross, inscribed in a quadrangle, represents the form of the edifice; the exact breadth is two hundred and forty-three feet, and two hundred and sixty-nine may be assigned for the extreme length from the sanctuary in the east, to the nine western doors, which open into the vestibule, and from thence into the _narthex_ or exterior portico. That portico was the humble station of the penitents. The nave or body of the church was filled by the congregation of the faithful; but the two sexes were prudently distinguished, and the upper and lower galleries were allotted for the more private devotion of the women. Beyond the northern and southern piles, a balustrade, terminated on either side by the thrones of the emperor and the patriarch, divided the nave from the choir; and the space, as far as the steps of the altar, was occupied by the clergy and singers. The altar itself, a name which insensibly became familiar to Christian ears, was placed in the eastern recess, artificially built in the form of a demi-cylinder; and this sanctuary communicated by several doors with the sacristy, the vestry, the baptistery, and the contiguous buildings, subservient either to the