THE ARTIFICIAL ROCK GARDEN 51 



which it gradually dies away into the rising 

 ground beyond. 



If the reader has been able to follow this 

 description, he will see the necessity of working 

 out the general scheme of the banks as he 

 proceeds with his excavations. 



There are a few things to be observed 

 which may help him in deciding w^here the 

 level or where the steeper places should be. 

 It is generally found to be more effective if 

 the sharper gradients are made on the con- 

 vex curves, while on the concave are the level 

 spots and more gentle slopes. The advantage 

 of this is fairly obvious, for in the former case 

 the steep rockwork will stand out boldly and 

 naturally form a corner, while in the latter the 

 banks form a hollow which lends itself to the 

 formation of a level spot at their base. 



If these ideas are carried out, there will be 

 no danger of having the same formations 

 opposite each other on either side of the path, 

 for where the curve is concave on one side it 

 follows that it must be convex on the other, 

 and vice versa. 



It will give a pleasing variety if in some 



