1891.] PUBLIC DOCUMENT — No. 4. 281 



Artificial Manures. 



1. Raw or green bones or bone-dust should be purchased 

 as "pure." Raw bones guaranteed to contain forty-five 

 to forty-eight per cent of tribasic phosphate of lime, and 

 to yield not less than four per cent of ammonia. 



2. Boiled bones should be purchased as " pure." Boiled 

 bones guaranteed to contain from fifty-five to sixty per cent 

 of tribasic phosphate of lime, and to yield not less than one 

 per cent of ammonia. 



3. Dissolved bones are made of various qualities, and 

 are sold at various prices per ton ; therefore the quality 

 should be guaranteed under the heads of soluble phosphate 

 of lime, insoluble phosphate of lime, and nitrogen, or its 

 equivalent as ammonia. The purchaser should also stipulate 

 for an allowance for each unit per cent which the dissolved 

 bones should be found on analysis to contain less than the 

 guaranteed percentages of the three substances already men- 

 tioned. 



4. Mineral superphosphates should be guaranteed to be 

 delivered in a sufficiently dry and powdery condition, and 

 to contain a certain percentage of soluble phosphate of lime, 

 at a certain price per unit per cent, no value to be attached 

 to insoluble phosphates. 



5. Compound artificial manures should be purchased in 

 the same manner and with the same guarantees as dissolved 

 bones. 



6. Nitrate of soda should be guaranteed by the vendor 

 to contain ninety-five per cent of pure nitrate. 



7. Sulphate of ammonia should be guaranteed by the 

 vendor to contain not less than twenty-four per cent of 

 ammonia. 



8. 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. 



JV. B. Artificial manures should be guaranteed to be in 

 a sufficiently dry and powdery condition to admit of distri- 

 bution by the drill. A sample for analysis should be taken, 

 not later than three days after delivery, by emptying several 

 bags, mixing the contents together, and filling two tins hold- 



