136 ROCK GARDENS 



divisions I fixed a lead trough or tray, com- 

 pletely filling the bottom. This tray, which 

 is filled with water, is therefore 4 feet by 3 

 feet, and about 4 inches deep. An inch pipe 

 connected with the tray goes through a hole 

 cut in the back of the frame, and protrudes 

 about 2^ inches beyond the woodwork. By 

 means of this pipe it can be seen at a glance 

 what amount of water is in the trough, and, 

 through it, more can be added if necessary. 



When I had ascertained that the trough was 

 quite level, which can easily be done by filling 

 with water, I placed perforated zinc all over 

 it, about 2 inches from the bottom. The zinc 

 I kept in position by resting it on some flat 

 tiles about 2 inches thick. Over this I put 

 small stones to a depth of about half an inch, 

 and then about 8 inches of granulated peat. If 

 this description has been carefully followed, it 

 will be seen that about i inch of the peat is in 

 water. By this means moisture will be drawn 

 up through the whole mass, which will be kept 

 constantly damp, and all that will be necessary 

 to maintain this condition is occasionally to 

 look at the pipe which protrudes outside the 



