124 



GARDEN DESIGN 



shell, when it can be rolled without fear of " picking 

 up." The secret of making good tar-paving is to 

 use plenty of tar and have it boiling. 



The surface of paths should be concave in shape. 

 A good rule for curvature is to give 2 in. rise 

 in the centre for a path 10 ft. wide and so on 

 in proportion. Thus a 5 ft. path is raised I in. 

 in the middle. This rule is limited to a 6 in. 



DIAGRAM 42. 



rise which is considered sufficient even for a 

 width of over 30 ft. 



Concrete is also sometimes used for paths. 

 Paving bricks set in cement are nice for small 

 alleys in formal designs. For long wide paths 

 they are too hard, and besides, the expense would 

 be prohibitive to most people. Bricks laid dry, 

 i.e. without mortar, are also pretty, and they can 



