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the soil of the rock garden. In the case of almost vertical con- 
struction avoid overhanging rocks, but instead build with a batter, 
recessing the rocks slightly as you build, taking care that the upper 
surface of each stone slopes down and inward. 
When stratified rocks are used, it is desirable so to place them 
that the lines of stratification are uniform throughout, though not 
necessarily horizontal. It is true that in nature one often finds 
the stratification considerably confused and jumbled due to geo- 
logic upheavals, but is is difficult to make such a style of construc- 
tion look convineing in an artificial rock garden. 
One of the most satisfactory kinds of rock gardens is that made 
in the form of a winding ravine. A garden constructed on these 
lines gives every lesideratum when dealing with diff- 
cult plants. A very good illustration of this type is to be found 
in the Hanbury Garden at Brockhurst in Sussex, England. 
Here a large part of the garden was made by excavating in sand- 
stone rock, thus forming a deep ravine with almost vertical sides, 
the crevices in the rocks afterwards being filled with suitable soil 
and planted. The rock obtained in excavating was used to extend 
the garden. 
Of an entirely different type is the rock garden at Friar Park, 
Ilenley-on-Thames, the country estate of the late Sir Frank 
Crisp. This is one of the largest and most pretentious rock 
gardens in existence covering, as it does, several acres of ground. 
Over 7,000 tons of rock were used in its construction and many 
of the pieces weigh up to 12 tons. This garden is of the mound 
type and a feature in it is a replica, made to scale, of the peak of 
the Matterhorn. 
an 
Other developments of the rock garden idea in gardens may 
be seen exemplified in the garden of Childerly Hall in Cambridge- 
shire, England, where tere | is a pleasing rock arrangement of the 
flat type, the planting associated with it being of the herbaceous 
perennial order, as well as the plants that one usually associates 
with the rock garden. 
The late Reginald A. Malby constructed a fascinating and 
unique rock garden in his London back yard on a plot of 30 X 70 
feet. This garden is unique in that the “ rocks”? used are pieces 
of concrete obtained from a demolished road. These irregular 
