34 ALPINE PLANTS 
by a good bank of soil, and in the course of building, every 
layer of stones must be thoroughly well packed with soil, 
so that from the commencement the plants have a rooting 
medium capable of sustaining them until they eventually 
reach the main body of soil behind. Where circumstances 
prevent the utilization of such a bank of soil, the best 
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A WELL-CONSTRUCTED WALL GARDEN. 
Only a few plants are shown, in order to clearly indicate the method of building. 
alternative is to build a double wall, with a space of at least 
a yard between the two faces, this space to be filled with 
good, moisture-retaining soil, and the top levelled down 
and left uncovered to receive the full benefit of all the rain 
that falls. 
On the sunny side of such a wall, a great variety of 
plants may be planted, including as examples, Dianthus 
