67 
circumstances would admit of the application ; on the 
Southern range of diluvium 'near the Aire much of 
this land lies contiguous to the clay of fifteen yards ; 
and on the Northern range near Doncaster, some 
portion of the yellow clay and. boulders would be 
suitable. But clay requires exposure to the atmosphere, 
and not too great a dose applied at once ; 120 cubic 
yards will cover an acre one inch thick ; and if the soil 
be six inches deep, there will be 14f per cent, of clay or 
marl added to the soil. All the clays on the New 
Red Sandstone are, in fact, marls. 
With reo:ard to the a^-riculture of the alluvial soils of 
Bentley, Arksey, &cc. I have little to say. The rotation 
is this: 1, fallow (limed), except turnips; 2, barley or 
maslin ; 3, clover or beans (manured) ; 4, wheat. 
Here each exhausting crop alternates with a restorative 
one ; and half of the farm is under an exhausting, and 
half under a restorative system; but this course is 
defective, as mentioned before ; that the same kind of 
crops return at too frequent intervals. The land also 
would bear a more exhausting rotation, and probably 
that pursued on rich clays would suit it, viz. : 1, summer 
fallow (manured) ; 2, wheat ; 3, sown grasses, for 
hay or green forage ; 4, oats ; 5, beans ; 6, barley 
or wheat. Here two-thirds of the farm is under 
exhausting, and one-third in summer fallow and 
restorative. It would be less severe if the grass were to 
remain two years in that state, and then three-sevenths 
would be restorative, and four-sevenths exhausting; 
and the course would fulfil, in an eminent degree, the 
condition that two crops of the same species should 
return at as distant intervals as possible. The pastures 
certainly are not growing the best grasses ; at least the 
superior grasses are not sown in the proportion in 
