COMMERCIAL FERTILIZERS. 



491 



cent, (equivalent to potassium sulphate, 5.55 to 7.40 per 

 cent.) ; nitrogen, 2.05 to 2.85 per cent, (equivalent to 

 ammonia, 2| to 3^ per cent.). 



Moisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Per cent. 



14.15 

 13.09 

 7.00 

 4.83 

 1.86 

 2.96 

 2.40 

 6.52 



Valuation per two thousand pounds : 



140. pounds of soluble phosphoric acid, 

 9G.6 i^ounds of reverted phosphoric acid, 

 37.2 pounds of insoluble i:>hosphoric acid, 

 69.2 pounds of potassium oxide, . 

 48. pounds of nitrogen. 



?31 23 



Economic Fertilizer, No. l,for Grass. 



(Economic Fertilizer Company, Butler, Breed & Co., Agents, Boston, Mass. ; col- 

 lected of H. P. Rogers, AUston, Mass.) 



Guaranteed composition : Total phosphoric acid, 41 per 

 cent. ; alkalies, 14^ per cent. ; nitrogen, 2 per cent. 



IMoisture at 100° C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insf)luble phosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Per cent. 



1.27 

 8.37 



none. 

 2.12 

 6.25 



none. 

 1.86 

 5.16 



Valuation per two thousand pounds : — 



42.4 poimds of reverted phosphoric acid, . 

 125. pounds of insoluble phosphoric acid, . 

 37.2 pounds of nitrogen (in niti'ates), . 



