146 



GARDEN PLANNING 



the path, supported by a retaining board, 

 rubble wall, or by rockwork. If the lower 

 boundary is a fence, the water which drains 

 to that level will tend to rot it. It is good 

 practice, therefore, to make the fence open 

 for two or three inches above the ground sur- 

 face. If the boundary is a wall it may be 

 necessary to introduce a rubble drain along 

 its foot. In neither case, however, would such 

 an expedient be necessary unless the soil was a 

 heavy and impervious one. A narrow border 

 along the lower boundary will usu- 

 ally serve as sufficient drainage. (^^^ 



transverse direction it may be necessary to re- 

 make the ground by raising the lower side with 

 soil taken from the higher, and if the lower 

 boundary is a fence this would necessitate a 

 bank, as it would not be feasible to allow any 

 depth of soil to lie in contact with the fence. 



When the slope is steep in a 



