PART III. 



ARCHITECTURE. 



123 



supply the deficiency. In some romantic situations, such as 

 occur in Wales or Switzerland, the cross, a sublime emblem, has 

 been introduced above the keystone with good effect. Perhaps 

 niches may be introduced in some places ; but in general it will 

 be found the safest rule not to bestow designedly any ornament 

 whatever. Among some of the noblest bridges in this island is 

 that of Perth : it consists of thirteen large circular arches, sup- 

 ported by high slender piers ; the whole has no other ornament 

 than a plain (Grecian cornice, which is carried across under the 

 parapet on a level with the surface of the road. The simpli- 

 city and elegant proportions of this bridge deserve particular 

 attention. 



