140 Report of tIie Chemist of the 



To avoid confusion, we give in our tables of analysis only the 

 amount of available phosphoric acid and of total phosphoric acid. 

 The total includes the available plus the insoluble. The law 

 holds manufacturers to the amount of available phosphoric acid 

 guaranteed. 



{3} Potash. — Potash may be present in a fertilizer in the form 

 of muriate, sulphate or, less often, carbonate. Our statement 

 of analysis does not distinguish the precise form in which the 

 potash exists in the fertilizer, but simply states the amount of 

 potash soluble in distilled water, without regard to the special 

 form in which it may be present. 



(4) Comparison of Amounts Guaranteed and Found. — In the iirst 

 line under each brand of fertilizer we state the amount of nitro- 

 gen, phosphoric acid, and potash " guaranteed " by the manu- 

 facturer; and in the line below the amount of these constituents 

 "found" by the Station analysis. In the third line we give the 

 amounts " below guarantee," when we find less than the manu- 

 facturer guarantees, and the deficiency is greater than two-tenths 

 of one per cent. Marked deficiencies are objectionable under 

 any circumstances, and are especially so when they occur in the 

 same brand of goods continuously for several seasons. 



2. Trade-values of Fertilizing Ingredients in Raw Materials 

 AND Chemicals, Adopted by Experiment Stations. 



1896. 

 Cts. per lb. 



Nitrogen in ammonia salts 15 



Nitrogien in nitrates 13% 



Organic niti-ogen in dry and fine-ground fish, meat and blood, and 



in higli-grade mixed fertilizers 14 



Organic nitrogen in eotton-seed meal and castoT-'pomace 12 



Organic nitrogen in fine-ground bone and tauliage 13% 



Organic nitrogen in fine-ground medium l)one and tankage 12 



Organic nitrogen in medium lione and tanliage 9 



Organic nitrogen in coarser bone and tankage 3 



Organic nitrogen in hair, horn-shavings and coarse fish-scraps. ... 3 



Phosphoric acid, soluble in water 5% 



Phosphoric acid, soluble in ammonium citrate 5% 



Phosphoric acid in fine bone and tankage 5 



Phosphoric acid in fine medium bone and tankage 4 



Phosphoric acid in medium bone and tankage. 2% 



Phoisphoric acid in coarser bone and tankage 2 



Phosphoric acid in fine-ground fish, cotton-seed meal, castor-pomace 



land wood ashes 4% 



Phosphoric acid insoluble in ammonium citrate, in mixed fertil- 

 izers 2 



