Purchased Food, and of its Residue as Manure. 
221 
Thus he has calculated to exist, in the manure from one ton 
ot linseed-cake, decorticated cotton-cake, and barley meal respec- 
tively — 
Ammonia 
Potash 
Phosphate of lime 
^Linseed^ke. B^rler-meal. 
I 1 
lbs. 1 lbs. lbs. 
116-3 I 159-1 38-1 
36-4 I 69-2 I 12-1 
104-7 149-0 i 28-7 
At %d. per lb. for ammonia, 2d. per lb. for potash, and \d. per 
lb. for phosphate of lime, the preceding quantities of these con- 
stituents in the manure from a ton of these three kinds of food 
are worth — 
In Llnsced- 
cake. 
In Decorti- 
cated 
Cotton-cake. 
In Barley- 
meaL 
Potash 
Total money-value of the manure'l 
£ s. d. 
3 17 6 
0 6 3 
0 8 9 
£ «. d. 
5 6 1 
0 11 6 
0 12 5 
£ S. d. 
15 6 
0 2 0 
0 2 6 
4 12 6 
6 10 0 
1 10 0 
In a similar manner the manure-value of a ton of undecorti- 
cated cotton-cake has been estimated at '61. l%s. 6d. ; that of 
rape-cake, at 4Z. I85. Qd. ; and that of barley-straw at 10s. 9d. 
per ton. 
The present price of linseed-eake in London is 12Z. 10s. per 
ton ; of decorticated cotton-cake, lOZ. per ton ; undecorticated 
cotton-cake, 8/. ; rape-cake, 81. 15s., and barley-meal, 9/. 5s. 
per ton. 
It will be seen that whilst the estimated value of the manure 
resulting from the consumption of a ton of rape-cake, selling at 
SI. 15s. per ton, is 4/. ISs. 6f/., the manure-value of a ton of 
barley-meal, costing 9/. 5s. per ton, is only 11. 10s. The price of 
linseed-cake is 12/. 10s. per ton, and its estimated manure-value, 
4/. 12s. Qd. ; whilst decorticated cotton-cake, which is sold at 
present in London at 10/. per ton, has a manurial value of 6/. 10s. 
The market prices of these and other feeding-stuffs thus have little 
connection with their manure-value. Deducting the value of 
the fertilising matters resulting from the consumption of the 
