44 A TREATISE OF 



As to the iieight of walls, it may be made 

 at the pleafure of the owner ; but I think ' 

 betwixt nine and twelve feet above ground 

 is fufhcient for any kmd of fruit-trees ; 

 for the diftance allowed from tree to tree 

 is before fixt, in proportion to the height 

 of the wall. 



The thicknefs of walls ought to be in 

 proportion to their height, and one of 

 tv/elve feet high ought to have two bricks 

 in length to the height of eight feet, and 

 from eight to twelve feet high, a brick and 

 half in thicknefs, to prevent the wall from 

 being too heavy at the top. 



CHAP. XIL 



. Obfervations on Stocks in general. 



WHAT ftock is moft proper for each 

 kind of fruit, ought as well to be 

 confidercd and known, as what foil is moft 

 fuitable to trees ; for on thefe two things 

 the future vigour of trees, and the goodnefs 

 of fruit, equally depend. The beft way 

 for thofe who intend to plant, is to raife 

 their own flocks, by which they will be 

 3 better 



