, APPENDIX. 23 



trees, chiefly alder, birch, mountain am, and woolly 

 poplar, all of which are extremely ufeful for the 

 country. 



Not more than from a foot to eighteen inches in 

 depth fhould be caft on the furface of the bank ; in, 

 cafe it be a fpongy red bog, more would render the 

 whole a caput mortuum. Befides the ufe of the fluff" 

 caft on the bank, for the purpofe of prefling out the 

 water, it alfo ferves to rot the furface, and render it 

 more capable of nourishing trees, than it would other- 

 wife do, and to render the whole more fertile ; all the 

 furfaces are made to meet, that is, the furface of the 

 bank, and thofe of the drains. 



By computing the area of the drains, and the foli- 

 dity of the bank, or the fluff caft up, it would appear, 

 that, at eighteen inches deep, the latter would only be 

 equal to about one-half of the former ; experience, 

 however, proves the contrary ; fo fubjecT: is all fpon- 

 gy bog to be reduced, when diverted of the fluid, 

 which, for the greater part, compofes it. 



The reader will pleafe to obferve, that the inner 

 fides of the drains are more, floped than the outfidc 

 ones ; the reafon is obvious, as they have a greater 

 weight to fuftain. 



Two fhillings a perch is the ufual price allowed for 

 the large drain, and eight-pence for the fmall one. 



Furze has been found to fucceed in thofe banks, 

 when they become fufficiently dry, but rooted plants 



anfwer 



