14 On the Valuation of Unexhausted Manures. 
sumed on the land, 17a'. for every 20s. of the original value of 
the manure may be allowed ; but if the roots be consumed in the 
yards, only 16s. If one corn-crop be afterwards taken, the coi'n 
sold, but the straw left on the farm, 9s. may be allowed ; if a 
second crop have been taken, the corn sold, but the straw left^ 
OS. should be allowed ; or if, instead of a second corn-crop, grass 
or hay be grown and consumed one year, 5s. ; but if the hay be 
sold, or the grass have been grazed a second year, only 2s. should 
be allowed. 
If such manure be applied directly for a corn-crop, the corn 
sold, and the straw left, 12s. for 20s. of the original value of the 
manure may be awarded. After a second corn-crop, 6s. ; or if, 
instead of a second corn-crop, grass or hay be grown and con- 
sumed one year, 8s. ; or if the first year's hay be sold, or the 
produce grazed or consumed a second year, only 4s. should be 
allowed. 
If the manure be applied directly to grass-land, and the produce 
is entirely grazed, 18s. may be allowed after one year, 14s. after 
two years, 8s. after three years, and 2s. after four years. If the 
manure be applied to grass-land, and hay be taken exclusively 
for consumption on the farm, the allowance should be 16s. after 
one year, l2s. after two years, and 6s. after three years ; or if 
the hay be sold, 10s. after one year, 4s. after two years, but nothing 
after three years should be allowed. 
3. Rape-cake (oe other Cake) used as Manuee. 
When rape-cake, or other cake, is used as manure, a consider- 
able portion of it decomposes pretty rapidly in the soil, and the 
more so the lighter and more porous the soil. It yields up 
much larger proportion of its nitrogen, and other manurial con- 
stituents, in the first year of its application, than does farmyard- 
manure ; and accordingly, in practice, a quantity not containing- 
one-fourth the amount of nitrogen of an ordinary dressing»of dung 
* would be applied to produce the same effect on the first crop. 
An ordinary dressing of rape-cake, therefore, after the first crop, 
leaves a very much less unexhausted residue than an ordinary 
dressing of dung. A given quantity of nitrogen applied as rape- 
cake would, on the other hand, be less rapidly available and 
effective than the same quantity applied as nitrate of soda, sul- 
phate of ammonia, or Peruvian guano ; but it would be less 
liable to loss by drainage, and would, therefore, leave a larger 
proportion as unexhausted residue after the first crop, than either 
of tlie above-named more rapidly active manures. 
If the outgoing tenant have applied cake as manure for a root- 
crop, and the roots have been consumed on the farm, he should 
