[ 213 ] 
four of his, which would be a faving of one day in 
four, fuppofing the ground to be equally well worked 
by both; but that is by no means the cafe, for ia 
Mr. Trerry’s the tracks made by the pins are at 
irregular intervals, and the work of fome of them 
totally loft, from their following in the track of thofe 
which precede them; which will appear to be the 
cafe, if lines are drawn from each pin parallel to the 
line of draft, as in my plan. Whereas in mine each 
pin will be found to make a feparate track, and the 
intervals between thofe tracks will be all equal; fo 
that the entire ground over which the harrow fhall 
pafs once will be marked with lines three inches 
afunder; and as the weight of my harrow is not 
greater than his, the fame horfes will work one- 
fourth more ground in the fame time, and do it 
much better. 
Another objection I find to Mr. Trerry’s har- 
row is, that the pofts being at right angles with the 
line of the draft, when the pins fink into the earth 
the pofts muft carry forward all the roots, clods, and 
ftones that it meets; but in mine, the pofts being 
nearly parallel to the line of the draft, thofe obftruc- 
tions pafs freely between them and under the rails 
which conneé them. And the hinge in mine being 
in the line of the draft when the harrow is drawn 
up and down ridges, it accommodates itfelf better to 
the fhape of the ground; the joint rifing when on the 
top of the ridge, and finking when it is in the furrow. 
I alfo 
