ARTIFICIAL MANURES. 177 
he quality should be guaranteed under the heads 
of soluble phosphate of lime, and nitrogen or its 
equivalent in ammonia. 
The purchaser should also stipulated for an allowance 
for each unit per cent; which the dissolved bones 
should be found, on analysis, to contain less than the 
guaranteed per-centages of the three substances already 
mentioned. 
_ 4. Mineral superphosphates should be guaranteed 
to be delivered ina sufficiently dry and powdery con- 
dition, and to contain a certain percentage of soluble 
phosphate of lime, at a certain price per unit per 
cent, no value to be attached toinsoluble phosphates. 
5. Nitrate of soda should be guaranteed by the 
vendor to contain from 94 to 95 per cent of pure 
nitrate. 
6. Compound artificial manures should be purchased 
in the same manner and with the same guarantees 
as dissolved bones. 
7. Sulphate of ammonia should be guaranteed by 
the vendor to contain not less than 23 per cent of 
ammonia. 
§. Peruvian guano should be sold under that name, 
and guaranteed to be in a dry and friable condition 
and to contain a certain percentage of ammonia. 
N. B.—Artificial manures should be guaranteed to 
be in a sufficiently dry and powdery condition to ad- 
mit of distribution by the drill.* A sample for ana- 
lysis should be taken, not later than three days after 
delivery by emptying several bags, mixing the contents 
together, and filling two tins holding about half a 
pound each, in the presence of a witness. Both the 
tins should be sealed, one kept by the purchaser for 
reference in case of dispute, and the other forwarded 
to a competent analytical chemist for examination. — 
AGRICULTOR, 
GENTLEMEN, —Referring to the useful rules to guide 
purchasers of artificial manures in the letter of your cor: 
respondent ‘‘ Agricultor,”? I would be disposed to sub- 
scribe to them all, preserving a right of private judg- 
ment in the case of No. 4, where it is stated that in 
mineral superphosphates no value is to be allowed to 
* Manures are generally mixed with a large proportion 
of sifted burnt earth preparatory to distribution, and there 
is Inside the manure box on the drill a roller with teeth 
placed at intervals driven by a cog-wheel or axle of the 
we of the drill to better insure the pulverisation ofthe 
mixture. 
