544 
Value of Artificial Manures. 
For 100 Tons. 
Moisture .. .. 8-40 per cent. 
Organic Matter, &c. 25- 75 at 1/. per ton 25 15 
Insoluble Matter .. 6-63 ,, 
Soluble Phosphate 18-20 at'33Z. ,, COO 0 
Insoluble Phosphate 6"91 ,, at 7/. 48 0 
Sulphate of Lime . . 38-78 ,, at 1/. 38 15 
Alkaline Salts .. 1-19 ,, at IZ. 1 4 
Ammonia .. .. 4-29 ,, at 56/. , 240 16 
954 10 
or 9Z. 10s. per ton. 
Tliis manure would probably be sold at from 8/. 10s. to 9/. 
per ton, and it would be worth this price, providing that the 
principle of combining a considerable percentage of nitrogen 
with soluble phosphate be fully affirmed. As I said before, such 
an assumption is absolutely necessary in these calculations ; indeed 
without its acceptance the manufacturer is egregiously in error 
in producing manures of this class. I shall content myself with 
one more illustration of the use of this method of calculation. 
The sample 25 on the list of superphosphates has evidently 
been made with a fair quantity of phosphate of lime, but from 
want of knowledge of the methods of manufacturing the manure, 
probably rather than any desire to supply an inferior article, the 
quantity of sulphuric acid has been too small to dissolve a proper 
quantity of phosphate. Mark the result in the value of the 
article : — 
For 100 Tons. 
Moisture .. .. 13- 10 per cent. ~' 
Organic Matter, &e. 8-75 ,, at iZ. per ton 8 15 
Insoluble Matter .. 8-15 ., 
Soluble Phosphate 8-10 ,, at 33Z. ,, 271 6 
Insoluble Phosphate 26-76 ,, at 7Z. , 187 10 
Sulphate of Lime .. 33-00 ,, at iZ. ,, 33 0 
Alkaline Salts .. 4-75 ,, at IZ. ,, 4 15 
Ammonia . . . . 1-30 , , at 56Z. , , 72 8 
577 14 
or 5/. 15s. per ton. 
This instance, however, brings to view a weakness in the 
method of calculation, and may very safely be referred to as 
showing how much judgment is required in the application of 
any money test to manures. The sample of superphosphate, 
of which the analysis is here given, is certainly not worth 5/. 15s. 
per ton, for it is verv deficient in soluble phosphate ; but the 
great proportion of insoluble phosphates tends to enhance the 
apparent value, amounting as it does to nearly 21. per ton of the 
sum. The fact is, that insoluble phosphate in a manure, unless 
it proceeds from bones or guano, is not worth, agriculturally, the 
