SKETCHES BY A PRACTISING ARCHITECT. 11 



the radius beyond the circumference one intercolum- 

 niation, and describe the portion of an arc of a con- 

 centric circle, radii drawn to the extremities of which 

 would bisect the third and fourth columns, counting 

 from the eastern intercolumniation. 



" Continue five rows of columns eastward ; parallel 

 to each two, on the right and left of the eastern in- 

 tercolumniation, preserving the diastyle division. 

 Raise nine rows of columns westward parallel to each 

 two on the right and left of the eastern intercolum- 

 niation. Raise also five rows of columns, parallel to 

 each one on the right and left of the northern and 

 southern intercolumniations. With the diastyle se- 

 paration describe the walls of the church, round the 

 columns already raised. Bisect the north-eastern 

 wall ; and from the point of bisection, with a radius 

 from the centre of the rotunda, describe the concentric 

 portion of an arc, which will of course bisect the 

 eastern wall of the northern side of the church. 

 Describe, as before, the two concentric arcs opposite 

 the seventh, thirteenth, and seventeenth intercolum- 

 niations, counting always from the eastern. We 

 shall have then four segments of circles, which will 

 be as many lateral chapels. 



" The grand front, which will be Doric, from the 

 middle Pcestan temple, will present to the west a 

 hexastyle portico five ranges of columns deep ; Ber- 

 nini's colonnade, omitting the walled arcade, will 

 diverge to the right and left of the four inmost ranges 

 of columns. The grand front will then project one 

 range of columns ; and this would mark it sufficiently. 

 The eastern front might present a hexastyle Psestan 

 Doric portico, of half columns only ; for windows 

 here would be necessary. The northern and southern 

 fronts might terminate with plain Antse. Antse 

 might also break the lateral walls, both within and 

 without. 



^'The exterior columns and walls to be of Traver- 

 tine ; the interior columns and walls of white Carrara 

 marble. The order : Segestaii Doric. 



