I 4 APPENDIX. 



Perhaps the under (ketch may ferve better to ex- 

 plain this, than all I have faid. 



After tbe frame be made, it may be cut at a, a, 

 which is the fureft method to have it made accurate ; 

 however, where the back requires but little fluff to be 

 caft to form it, and that it is intended to finifh off io. 

 one feafon, the frame may be left of the whole length, 

 and, in that cafe, one of the crofs bars at a, a, may be 

 omitted. In any cafe, the workmen will prefer the 

 Ihort frame, as it is mote manageable than the other. 



From what has been remarked, the fhuation mutt 

 always determine the depth of the ground to be cut 

 away ; in proportion as the bank rifes behind the wall, 

 the more cutting will be neceflary, and the lefs filling 

 will be required. Where the fituation is level, or 

 nearly fo, two feet below the iurface is the ufual depth 



to 



