46 



CONTROL SERIES No. 51 



Phosphoric Acid Compounds. 



The following table gives the analyses of those fertilizer simples valued chiefly 

 for their phosphoric acid: 



Superphosphate (Acid Phosphate), Precipitated Bone, Basic Slag Phos- 

 phate and Phosphate Rock. 



BRA^^D Showing a Commercial Shortage of $1 or More per Ton. 



Eastern States Farmers' Ex- 

 change 



E. S. Precipitated Bone 



38.00 



a Three analyses. 



6 Two analyses. 



<• Guaranteed 33%. 



d Mixture of superphosphate and ground tobacco stems. 



e Commercial shortage, $1.07 per ton. 



