the Pavement to the Bottom of the Curvature of the upper Galleries, ’tis of a square Figure, but as contracted within the Enclosure of the four large and the four smaller Pillars, as far as the Curvature of the four Arches of the _Dome_, it is entirely of an oval Form. The Form of the Galleries is as follows: On three Sides of them they are built in a square Manner: The fourth Side of them, which looks into the Church, is of an oval Figure, as is the Church itself. The Roofs of these Galleries are supported with Arches and Columns. I shall give the Reader a Description of three of them, by which means he may easily form a Judgment of the rest, for they are all of one Form. Those I shall take Notice of, are the three upper Galleries on the North Side of the Church. The first of these Galleries has two Fronts, and looks both Eastward and Northward. The two Sides of this Gallery rise from the Wall of the Church, and end in an Arch. In the Middle of each Side of it there are three square Columns five Foot and nine Inches in Circumference, which are made the Jambs of the Windows. These Pillars support three other square Pillars, which are all made of blue and white Marble. The Side which faces the Body of the Church is adorn’d with six Pillars of green Marble, standing below the Arch which supports an Eastern _Semi-dome_, whose Shafts at the Bottom of them are seven Foot and eight Digits in Compass. The _Intercolumniations_ of these Pillars being little less than seven Foot and eleven Digits wide, are strengthen’d with Marble _Closures_ which are four Foot high, so that those who lean upon them, have a full View of all the upper and lower Part of the Church. That Side which parts the first and second Gallery, reaching from the outward Wall Northward, to the great Pillar which supports the _Dome_, is forty four Foot in Length, part of which is adorn’d with Pillars, and an Arch which supports the _Dome_. You pass through this into the second Gallery, the Breadth of which is twenty four Foot, and it is made up of the Arch of a Pillar, and a Wall which is a part of one of the Wings of the Church, and extends itself as far as the Roof of the _Dome_. This Gallery, at both Ends of it, is born up by Arches and Walls. In the Middle of it, it is supported by four white Pillars speckled with blue, the Shafts of which are seven Foot in Compass. ’Tis of a square Figure, and, as I observ’d, bears upon Arches and Walls. These Arches, at one End of them, rise behind two of the large Pillars which support the _Dome_; at the other End they bear upon Pillars which rise within Side of the Walls, and support the four large Pillars. The outer Side of this Gallery is supported with eight square Pillars, which are six Foot in Compass. There rises in the Middle of them a Pillar of a larger Size. These Pillars are instead of Jambs for the Windows; and above them there are other Pillars, which are also Jambs to other Windows. These