6 ALPINE PLANTS. 
as not to tread upon the newly-relieved 
ground ). 
The top-dressing should be done in the 
autumn, and should be preceded, as I have 
said above, by forking up. 
A great deal more might be said on the 
subject of drainage and soils, but time and 
space will not allow of it here. 
At the end of the book will be found a list 
of the most useful Alpines for different 
positions, such as full sun, partial shade, &c. 
The plants for limestone and sandstone rock- 
eries are also there catalogued. 
