[ 32 ] 
convinced how feverely the fyftem has been injured 
by it. I muft here again repeat, for it cannot be too 
rigidly infifted on, that on thefe operations being wel} 
followed up, the whole advantage will depend; and 
this leads me to obferve, that on thofe foils where 
this cannot be done, perhaps drilling may be altoge- 
ther improper.—A queftion then naturally arifes, on 
what foils is drilling pra@ticable with advantage, and 
on what is it improper? I conceive it practicable on 
all foils that are not very ftony or rocky, or fo very. 
declivous that the machine or fcarifier cannot be 
worked with two horfes with facility. It has been 
faid by fome gentlemen who haye tried on heavy clay 
foils, that thefe are unfavourable to its ufe, that the 
coulters do not depofit the feed deep enough in the 
foil. In the heavieft foils I have tried, it produced 
me the fineft crops. Ihave never occupied any very 
obdurate clayey foils, but on thofe ftrongeft loamy 
foils which I have drilled, I have produced the beft . 
crops, and comparatively more produétive than on 
the lighter ones; and am therefore inclined to believe, 
that few foils are to be objected to as unfavourable 
to the fyftem, on account of their ftiffnefs merely. 
To fay thefe foils will only work in a certain degree 
of moifture and temperament, and therefore will not 
admit of drilling, is faying nothing, but what may be 
faid again{ft ploughing or harrowing, &c.—When- 
ever the foil is in a condition to admit of harrowing 
or dragging, it may be drilled with propriety. 
Having 
