264 BOARD OF AGRICULTURE. 



" On the other side, the following trademark will be stamped : 



SjOJVIAN GU AHo 



Guaranteed. 



"Below this trademark will be printed the analysis of the guano, indi- 

 cating the percentage of ammonia, soluble phosphoric acid, reverted* phos- 

 phoric acid, insoluble phosphoric acid, and potassa contained in the guano, 



" Lastly, below the analysis, will be marked the price of the ton of 

 2,000 pounds, calculated after the following rates:— 



" The ammonia will be valued at the rate of . . . $3 50 per unit, 



soluble phosphoric acid will be valued at the rate of 2 00 " 

 reverted phosphoric acid will be valued at the rate 



of 1 60 



insoluble phosphoric acid will be valued at the rate 



of 40 



potassium oxide acid will be valued at the rate of . 1 50 " 



" These values correspond to — 



" For ammonia (or nitrogen, per pound, $0.21|), 

 soluble phosphoric acid, .... 

 reverted phosphoric acid, .... 

 insoluble phosphoric acid, .... 

 potassa (as phosphate of potassa), 



" The prices established as above, and stamped on the bags, will be the 

 retail price in all ports in the Atlantic States. 



" It must be evident to every one, that Peruvian guano, treated as herein 

 explained, and which will be called '■'Peruvian Guano Guaranteed,''' 1 will 

 be free from the complaints which farmers have sometimes made against 

 the raw article sold as imported. Nor is the guaranteed guano liable to 

 be misrepresented by those interested in depreciating all fertilizers, 

 except those they are interested in. 



* By reverted (or reduced) phosphoric acid is understood phosphoric acid which, 

 although not soluble in water, becomes so under the chemical conditions of the soil. 

 The test of this is, that the phosphoric acid be in a state to promptly dissolve in a 

 solution of citrate of ammonia, and such is the case with the greater part of phos- 

 phates contained in Peruvian guano. 



