32 On the Valuation of Unexhausted Manures. 
we at present possess bearing upon the subject, it would be a 
matter of very great difficulty to lay down rules which shall be 
generally applicable for the estimation of the productive, and 
consequently of the money-value of the unexhausted residue of 
manures which have previously been applied to the soil, and 
have already yielded a crop. 
The results of direct experiments have shown that some 
important constituents of manure either leave little or no unex- 
hausted residue in the land after the first crop, or leave it so 
combined within the soil, or so distributed throughout it, that 
it produces little or no appreciable effect on succeeding crops. 
Some manures, on the other hand, produce marked effects for 
several years after their application. It is obvious, therefore, 
that it would require a very complicated sliding-scale to enable 
us to estimate the value of constituents already under ground 
under the very varying conditions that would arise, as to the 
description and the amount of the manure employed, the cha- 
racters of the soil and subsoil, the dryness or wetness of the 
particular locality or of particular seasons, the description of 
crop grown, the cleanliness or foulness of the land, and so on. 
It seems extremely desirable, therefore, that every attempt 
should be made to arrive at some mode of estimating the com- 
pensation due to an outgoing tenant for his unexhausted 
manures founded on the valuation of what is above ground, the 
amount and the value of which can be easily ascertained, rather 
than to leave his claims to be settled by the conflicts of practice 
and science in Courts of Law. Tenant-farmers would find an 
Act for compulsory compensation dearly bought on such terms. 
In my Paper read before the London Farmers' Club, in April, 
1870, I made some suggestions with a view of estimating com- 
pensation by the valuation of certain products of the farm. 
These, with some modifications, I propose to re-state here, in the 
hope that they will, at any rate, receive that full and candid 
criticism without which the principle they involve should be 
neither accepted nor rejected. - 
If the plan in question were adopted, it would be desirable 
that the time of entry should be Lady-day. The items upon 
which I would base the valuation in favour of the outgoing- 
tenant are, — 
1. The farmyard-manure made during the last six months of 
the occupancy. 
2. The manure from the consumption of purchased food which 
has not yet grown a crop. 
3. The straw of the corn-crops of the niext harvest. 
The farmyard-manure would be valued to the incoming tenant 
by the load or ton. The price of the dung, per load or ton, would 
