The Work of Construction 21 



of earth. The run should slope downward 

 slightly. 



Rocks calculated to simulate a natural 

 stratification ought to be laid on an in- 

 cline for proper drainage. Such pieces 

 of rock may also be employed sparsely in 

 wedging, and in the making of the so- 

 called "pockets." 



These pockets are of prime importance 

 in the construction of a rock garden. 

 They hold the only considerable spaces of 

 soil and are the chief means of colonizing 

 plants, thus providing for pronounced 

 color effects. They should break the 

 slopes and be irregular in size, shape, and 

 distribution. The large ones may be easily 

 subdivided by small stones when the plant- 

 ing is done if a further separation of 

 species is desirable. The soil must slope 

 a little from the top, so that there will 

 be no standing water. 



