186 



SEASON 1875-76. 



pressure produced by a rise of water was never at Craigend 

 perfectly compensated. But as the ponds were under constant 

 supervision, no loss has yet occurred through floods, although very 

 considerable trouble and anxiety has often arisen. The sluice- 

 box was furnished with a screw-sluice, and could be set to any 

 opening very exactly. Below is a plan and section of the leaf- 

 screen and box (Figs. 135, 136). 



-11 -5+t- 



FIG. 135 scale fa 



FK;. 136 scale 



The upper pond at Craigend was originally made about 100 feet 

 long and 1 6 feet wide, the lower one the same width, but not quite 

 so long ; the depth of each was only 4 feet. As these ponds have 

 since been very considerably altered, it is not necessary to describe 

 them more fully here. They will be again referred to under the 

 date of their improvement and completion. 



