322 
ployed ; and that those parts of it which are not 
fitted for one crop, remain as nourishment for an- 
other. Thus, in Mr. Coke’s course of crops, the 
turnip is the first in the order of succession ; and 
this crop is manured with recent dung, which im^ 
mediately affords sufficient soluble matter for its 
nourishment; and the heat produced in ferment- 
ation assists the germination of the seed and the 
growth of the plant. After turnips, barley with 
grass seeds is sown ; and the land, having been 
little exhausted by the turnip crop, affords the 
soluble parts of the decomposing manure to the 
grain. The grasses, rye-grass, and clover-remain, 
which derive a small part only of their organised 
matter from the soil, and probably consume the 
gypsum in the manure which would be useless to 
other crops : these plants likewise, by their large 
systems of leaves, absorb a considerable quantity 
of nourishment from the atmosphere ; and when 
ploughed in at the end of two years, the decay of 
their roots and leaves affords manure for the wheat 
crop ; and at this period of the course, the woody 
fibre of the farm-yard manure, which contains the 
phosphate of lime and the other difficultly soluble 
parts, is broken down: and as soon as the most 
exhausting crop is taken, recent manure is again 
applied. 
Mr. Gregg, whose ingenious system of cultiva- 
tion has been published by the Board of Agricul- 
ture, and who has the merit of first adopting a 
plan similar to Mr. Coke’s upon strong clays, 
suffers the ground after barley to remain at rest for 
two years in grass ; sows peas and beans on the 
