Value of Artificial Manures, 
541 
ammonia. The value of ammonia and phosphate of lime in 
bones is calculated on the supposition that these latter cost 
6/. 10s. per ton — that they contain 50 per cent, of phosphate of 
lime, and 7*3 per cent, of nitrogen. 
Dried blood is considered to contain 12 per cent, of nitrogen, 
and to cost from 8/. to 9/. per ton, 
In the Table it will be observed that organic matter, free from 
nitrogen, is valued at 10s. per ton ; when containing nitrogen in 
large quantity, at 20s. per ton. For instance, dried blood con- 
tains 80 or 88 per cent, of organic matter, chiefly or entirely 
nitrogenous. In calculating the value of dried blood I should add 
to the price of the ammonia 2^. {2^0(1. ) for every one per cent, of 
organic matter ; of course where little nitrogen or ammonia exists 
in a manure, the organic matter will be estimated at the lower 
price. 
In analyses of manures it is very usual, after recapitulation of 
the various ingredients, to give as " alkaline salts and loss," the 
difference between the numbers obtained and 100 parts. These 
alkaline salts will usually be principally soda, or would otherwise 
by a careful analist be mentioned as salts of potash ; I therefore 
attach to them only a very small value, namely, 1/. per ton. Let 
us now see in what way the Table above is to be made use of in 
calculating the value of a manure. We must of course suppose 
that the analysis of the manure is before us : and for the sake 
of illustration, we may take what may be considered a good 
specimen of superphosphate of lime. Calculating by the first 
column we shall proceed as follows : — 
A ton contains 2240 lbs. By multiplying the percentage of 
any ingredient by 2240, and dividing it by 100, or what is the 
same thing, by multiplying by 22 4, we at once obtain the 
number of pounds of the substance in a ton of the manure ; this 
multiplied by the price per lb., as taken fiom the table, will give 
the total value of this ingredient per ton of the manure. 
Per Cent. , 
Moisture .. .. 12'00 °- 
Organic Matter, &c. 17-00 = 381 lbs., -which, at ^'gd., are -worth 0 17 
Sand 4-00 
Soluble Phosphate 16^ = 369^ lbs., -which, at 3|J., are -worth 5 7 9 
Insoluble Phosphate 13 =291 lbs., -which, at |'/., are -worth 0 18 2 
Sulphate of Lime .. 41 =915 lbs., -which, at ly/., are -worth 0 7 7 
Alkaline Salts .. 2 = 44- 8 lbs., -which, at Vjrf., are -worth 0 4 5 
Ammonia .. .. TO = 22-4 lbs., -which, at 6d., are -worth 0 11 2 
Giving 7 10 8 
as the total value of the ingredients of a ton of good super- 
phosphate. 
This method, however, is laborious, and indeed the second 
column of the table obviates the necessity of one-half of the cal- 
VOL. XVI. 2 N 
