How to form an Outdoor Fernery. 15 
My own outdoor fernery was figured and described 
in the e Floral World 9 of January, 1867. It consists 
of walls and arches forming a sort of ruined bastion. 
It is entirely built of “burrs” from the brick kiln, 
which is the best material for the purpose in districts 
jrhere rough stone is not to be obtained. All the walls 
are double, and filled in with strong loam, and, of 
course, are roughly built, with many crevices and hollows, 
in which the ferns are planted. These walls may be 
likened to cases containing earth which is fully exposed 
on the summit to the weather, and consequently may 
be regarded as another kind of banks. The annexed 
diagram will give an idea of the principle of construe^ 
tion, though straight lines of course convey no idea 
of their form. 
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Where the walk passes through the bastion, the walls 
rise clear out of the gravel, but all round in the bays 
and inlets mounds of earth are raised against them, as 
would be the case in a real ruin, from the accumulation 
of rubbish. As a hint of the rough construction of 
the walls, and the nature of the effects produced, here 
is a il bit of scenery from the bastion, from a “photo,” 
