ARCADED WALKS AND PERCOLAS 159 



FIG. 43. A Timbered Pergola. 



able, are excellent ; but stout piers of stone, brick, or 

 tile if built with raked-out joints look very well, 

 especially if varied in plan, square alternating with 

 round or hexagonal sections. Where timber is 

 used for the posts as well as the flat roof, we can 

 use all the devices of the old mediaeval carpenter, 

 and should not neglect his rules. The appearance 



