22 On the Valuation of Unexhausted Manures. 
roots, the grain sold, and the straw left on the farm, 2*. for 20s, 
of the estimated value of the manure should be allowed. 
Special potass-manures, such as Kainit, are only profitable 
under such exceptional circumstances as to soil and cropping, 
that no special rule can be given for the valuation of the unex- 
hausted residue from their use ; and before any claim could 
l)e admitted, evidence of their utility on the farm in question 
should be required. When such utility is proved, the same pro- 
portion of the original market-value, founded on composition, 
might be allowed, under the same circumstances as to cropping, 
«Scc., as in the case of a mineral superphosphate. 
In the case of anv compound or refuse artificial manure, con- 
taining very little nitrogen, but a fair amount of soluble phos- 
phates, the same proportion of the estimated value of the manure 
may be allowed for unexhausted residue as if it were a super- 
phosphate. But if it contain verv little of either nitrogen or 
soluble phosphates, no allowance whatever should be made for 
its use ; excepting in the case of a potass-manure under the con- 
ditions above defined. 
The foregoing remarks as to the circumstances to be taken 
into consideration in valuing the unexhausted residue of the 
various compound or refuse artificial manures of more or less 
unknown or uncertain composition, and the scales of compensa- 
tion which have been suggested, will, it is hoped, serve as some 
guide to those who mav have to adjudicate on claims made in 
relation to such manures. At the same time, it will lie obvious 
that, owing to the great difference in the composition and value of 
such manures, no absolute rules can be laid down for the estima- 
ticm of the value of any residue they may leave in the soil. 
10. Liming, Chalkixg, M.vrlikg, &;c. 
Liming, chalking, and marling, are practices so far from 
being generally required, or generally adopted, in agriculture, 
and their cost and value are so dependent on local circum- 
stances, that no general rules can be laid down for the valua- 
tion of their unexhausted eflects. Still, where beneficially 
adopted, they would undoubtedly be fair subjects for compen- 
sation if the benefits were not unexhausted at the time of the 
tenant quitting his holding. If disputed, any claim should be 
settled upon the evidence, or might appropriately be submitted 
to the arljitration, of intelligent and disinterested persons of local 
practical experience. 
Such, then, are the results of an attempt, verv carefullv made, 
to construct a scale of valuation of the unexhausted residue of 
