Moisture, 

 Nitrogen, 

 Phosphoric acid, 

 Potassium oxide, 

 Calcium oxide, 

 Insoluble matter, 



2057-2060. I. Tannery refuse, taken from filter beds, received 

 from Walpole, Mass. 

 II. Tannery refuse, taken from vats in cellar, 

 received from Walpole, Mass. 

 III. Salt from manufacture of gun powder, received 



from Boston, Mass. 

 IV. Liquid by-product, received from East Walpole, 

 ]Mass. 



Moisture at ioo°C., 

 Nitrogen, 

 Phosphoric acid. 

 Potassium oxide, 

 Calcium oxide, 

 Insoluble matter, 

 Chlorine, 



The above class of substances are, in many instances, of only 

 local interest. Whenever they can be purchased at a reasonable 

 price and under the control of a chemical analysis, they oftentimes 

 furnish a valuable source of plant food. The high percentage of 

 moisture in many of these materials prohibits their transportation 

 by rail on account of the cost of freight. 



Not determined. 



