304 



BOARD OF AGRICULTURE. 



310.0 pounds of phosphoric acid, 

 104.4 " of nitrogen, . 

 32.0 " of potassium oxide. 



Total, 



Ko. III. 



Valuation. 



131 00 per ton. 

 26 00 " » 

 2 56 " " 



$59 56 



The samples Nos. III. and IV. contain about 4 per cent, 

 of nitrogen less than the preceding ones (I. and II.) ; they 

 differ, consequently, in regard to their commercial value, from 

 $20 to $24 per ton from the former. 



The frequent occurrence of similar results, in reference to 

 the chemical composition of the raw Peruvian guano in many 

 other countries, has been stated on a former occasion. 



In my last report I discussed, as I believe with fairness, 

 the unsatisfactory condition of our trade regarding this re- 

 puted standard fertilizer ; pointing out at the same time some 

 of the means, by which the just wishes of the farming com- 

 munity might be satisfied. 



