PLANTS FOR TERRACE GARDENING. 



377 



breakages, and, if properly constructed, are very durable. Ours (fig. 50) are 

 made of slate and pitch pine, being square in shape. The four sides and 

 the bottom are of slate slabs, f inch thick, with the sides bevelled, so that 

 they fit closely together, the bottom slate having provision made for 

 drainage by holes drilled therein. The pitch pine forms the framework, 

 which, when fitted together, is tightened at the top and bottom with 

 bolts and screws. No soil comes into contact with the wood by this 

 arrangement ; hence there is not the risk of decay. Another very durable 

 form of tub is made of slate only (fig. 51). 



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