590 On the Valuation of Unexhausted Manures. 
the land is pure peat ; 4 feet of the surface has been cut and 
removed for peat. 
The tenant used to purchase lime, but has given it up. 
Nine acres of first-year's seeds were cleared of hay, and a good 
strong root left. 
A bad boundary fence here belongs to the tenant. 
We consider that Mr. Whalley manages this farm of very 
moderate land with great skill and in a business-like manner. 
This concludes what we trust is a faithful Report of the 
inspection of Classes I. and II ; and though there may be 
a good deal of dry monotony in the reading, yet in the actual 
task of inspection, I may say that it was found to be one of 
instructive and pleasurable interest. 
XXIV^. — On the Valuation of Unexhausted Manures. By Sir 
John Bexnet Lawes, Bart., LL.D., F.R.S., and J. H. 
GiLBEKT, LL.D., Ph.D., F.R.S. 
We have been requested by the Chemical Committee of the 
Royal Agricultural Society to draw up a Table of the composition 
and value of the manure obtained by the consumption of the food- 
stuffs in ordinary use on the farm. About twenty-five years ago 
we published a Table showing the average composition, per cent., 
and per ton, of the chief feeding-stuffs, and other agricultural 
products ; and we called attention to the fact that there must be 
great difference in the value of the manure according to the 
composition of the food consumed. Soon afterwards, a Table 
was published showing the estimated money- value of the manure 
from the consumption of one ton of the various foods. » 
The Table of composition was founded partly on the results 
of analyses made at Rothamsted, but in great part on the results 
of others which had at that time been published ; and having 
calculated the amounts of nitrogen, phosphoric acid, and potash, 
contained in one ton of the respective foods, we deducted the 
quantities of phosphoric acid and potash wliich we estimated 
would be contained in the increase in live-weight of the animal 
consuming it. But, in the case of the nitrogen, we deducted 
10 per cent, from the amounts in a ton of the cakes and 
leguminous seeds, which contain high percentages of nitrogen, 
and 15 per cent, from the amounts in the foods which contain 
lower percentages of nitrogen. These amounts of nitrogen 
deducted, were reckoned to include, besides the nitrogen actu- 
ally stored up in the increase in live-weight, some loss, but not 
