520 



BOAED OF AGRICULTURE. 



Soluble Pacific Guano. 

 (Glidden & Curtis, Boston, Mass.; collected of Hanscom Bros., Haverhill, Mass.) 



Guaranteed composition : Soluble phosphoric acid, 6| to 

 8 per cent. ; reverted phosphoric acid, 1|^ to 3 per cent. ; 

 insoluble phosphoric acid, 2 to 4 per cent. ; potassium 

 oxide, 2 to 3^ per cent. ; nitrogen, 2|^ to 3^ per cent. 



Moisture at 100° C, 13.38 



Total phosphoric acid, 12.86 



Soluble phosphoric acid, 6.02 



Reverted phosphoric acid, 1.80 



Insoluble phosphoric acid, 5.04 



Potassium oxide, 2.99 



Nitrogen, 2.81 



Insoluble matter, . 8.00 



Valuation per two thousand pounds : 



120.4 pounds of soluble phosphoric acid, 

 36.0 pounds of reverted phosphoric acid, 



100.8 pounds of insoluble phosphoric acid, 

 59.8 poimds of potassium oxide, . 

 56.2 pounds of nitrogen. 



P 63 



2 70 



3 02 

 2 53 

 9 84 



$27 72 



Sparrow's B. B. High Grade SuperpJiosphate. 

 (Collected of G. W. Atkinson, Reading, Mass.) 



Guaranteed composition : Total phosphoric acid, 10 to 12 

 per cent. ; available phosphoric acid, 8 to 10 per cent. ; po- 

 tassium oxide, 2 to 3 per cent. ; nitrogen, 2^ to 3^- per 

 cent. ; (equivalent to ammonia, 3 to 4 per cent.). 



Moistm-e at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Per cptit. 



14.59 



10.81 



9.24 



1.32 



.25 



2.08 



4.00 



3.24 



