140 ORNAMENTAL PLANTATIONS. [Jan. 



as to form, at the fame time, the fence, or a part 

 of it, efpecially if executed in the funk-fence man- 

 ner. If furface water only is to be carried off, 

 fmall open cuts, or good plough furrows, con- 

 dueled into the matter drains, will generally be 

 found to dry the furface completely. Rubble 

 drains are improper in plantations ; being liable 

 to injury and ftoppage by the roots of the trees. 

 If it be necefiary to conceal a drain in an orna- 

 mental plantation when it pafles near to a walk, 

 or might be thought a nuifance, it mould be built 

 on the fides, paved above and below, and covered 

 over with earth. 



In trenching of the ground for a grove, fcreen, 

 or other ornamental plantation, if the foil be any 

 thing lefs than twenty inches deep, it may be faid, 

 in general, that it mould be trenched to its full 

 depth. The depth, however, of twenty inches, 

 or at the mod two^feet, is quite fufficient in any 

 cafe. In inftances where the foil is lefs than a 

 foot in depth, a fimple digging may anfwer ; or 

 it may be effectually prepared by the plough and 

 the harrow. Few inftances occur in trenching 

 for fuch plantations where it is necefiary to turn 

 up the fubfoil. It is always proper, however, to 

 break and mix the earth well in the operations of 

 trenching. 



In cafes where the foil is thin, and where it be- 

 comes neceflary, in digging or ploughing, to turn 



up 



