[ 434 ] 



ring to fome uncommon depth, fuch as eighteen 

 inches, which Mr. Arkuthnot did with a wheel- 

 plough of his own conftrii6lion, defcribed in my 

 firft volume, page 214, where Lhave alfo given a 

 plate of it. 



Before I conclude, I muft obferve, that the fin of 

 the fhare of Mr. Cooke' z fwing-plough is very nearly 

 as wide as the heel of the plough, by which means 

 the bottom of the furrow is as completely cut by it 

 as the land fide is by the coulter j thus nothing is 

 left to be done by the bread of the plough and 

 mould-board, but to raife the flag gradually, and 

 lay it over compleatly. 



I think it likewife necelTary to mention, that the 

 Suffolk cat-head and copfe (as defcribed in the 

 above-quoted effay, where a plate is given of them) 

 are what I ufe for regulating the width and depth 

 of my furrow. A fmall alteration in the length of 

 the ridger over the thill-horfe alfo fets the plough 

 ' more or lefs rank ; but it muft be obferved, that it 

 fliould never be taken up top ihort, for that creates 

 a very hurtful angle in the line of tradlion. Nei- 

 ther muft I omit to mention, that the rifing flag 

 fweeps along my caft-iron mould-board* fo glibly, 



* A cafl-lron mould-board is not a correal exprelTion, but we fay^ 

 as incorreiflly, a filver candlcftick, a glafs inkhorn, &c. prcferving the 

 names of the materials of which thefe utenfils were originally formed. 



touching 



