THE BOG GARDEN 99 



It should then be left for several days to 

 thoroughly set, when it can be tested by filling 

 up with water, which should rise to within 

 about 2 inches of the top of the wall and give 

 a depth of about 8 inches. If all is found satis- 

 factory, empty by means of the bottom pipe. 

 Now put in a layer about 6 inches deep of 

 fairly large stones, brick-bats, or any coarse 

 rubbish, to act as drainage ; over these place 

 a layer of sods, with the grass sides next the 

 stones. When doing this make sure that the 

 end of the overflow pipe is quite clear and that 

 the water can easily get to it. Having made 

 all secure, now fill in with a compost of peat, 

 leaf-mould, fibrous loam, sand, and broken 

 stones in the same proportions that were given 

 in the beginning of this chapter. 



If these directions have been carried out, you 

 will have a small (underground) pond with the 

 water kept at a constant level just over the sods 

 covering the drainage. The capillary attraction 

 of the soil will draw the moisture up and keep 

 it constantly damp. If the water to supply 

 these marshy beds has to be brought in pipes, 

 they should have a tap, so that the flow may 



