MANUFACTURER'S CATECHISM. 161 



Soluble Bone Phosphate 5| cents. 



Hydrated Phosphoric Acid 9|- " 



Hydrate of Ammonia 12,)- " 



Muriate of Potash 5 " 



Sulphate of " 4J " 



From the difference in the relative prices of 

 the different substances, the farmer can realize 

 the importance of knowing what are the com- 

 binations given by the manufacturers, as a basis 

 for computing the value of their fertilizers. And 

 for his assistance, we suggest the following line 

 of questioning to the manufacturer or the dealer, 

 when the farmer intends making a purchase of 

 fertilizers : 



MANUFACTURER'S CATECHISM. 



First. What percentage of phosphoric acid 

 (anhydrous), soluble in cold water, do you 

 warrant your fertilizer to contain ? 



Second. What percentage of insoluble phos- 

 phoric acid (anhydrous), do you warrant your 

 fertilizer to contain ? 



Third. What percentage of nitrogen, as it 

 exists in raw bone, blood, etc., do you warrant 

 your fertilizer to contain ? 



Fourth. What percentage of actual ammonia, 

 do you warrant your fertilizer to contain ? 



Fifth. What percentage of potash, do you 

 warrant your fertilizer to contain ? 



