32 

 Ground Bone and Tankage — Concluded. 

 Brands Substantially Meeting their Guarantees — Concluded. 



> Two analyses made. 



2 This product was not a bona fide animal tankage. Under the magnifying glass it was possible to 

 identify horn and hoof meal and clippings from casein buttons of various colors. Chemical analysis 

 showed the nitrogen to be of satisfactory quality and nearly 2 per cent above the guarantee. The phos- 

 phoric acid was fully up to the guarantee, but instead of about 50 per cent of it being soluble in neutral 

 citrate of ammonia, as shown by analyses made at this laboratory of over three hundred samples of animal 

 tankage, only about 17 per cent was found soluble, indicating an admixture of unacidified phosphate rock. 

 Further indication of the presence of raw mineral phosphate was shown by finding 1.50 per cent of iron 

 and alumina oxides and 2.17 per cent more of calcium oxide than was required to produce the bone phos- 

 phate of lime present as shown by the phosphoric acid test. Animal bone contains but mere traces of iron 

 and alumina and but little excess of calcium oxide unless the bones have been exposed to the weather for 

 many years, resulting in their partial decomposition. The company was notified that no further sales 

 of the product under the name of ground taiLkage would be allowed in Massachusetts. 



Wood Ashes. 



Note. — The average acid soluble potash, usually designated as total potash, in the ten samples was 

 6.58 per cent. Average wood ashes have about 31 per cent of calcium oxide and 3 per cent magnesium 

 oxide, both largely in form of carbonate and, therefore, capable of neutralizing soil acidity. The lime and 

 magnesia in a ton of wood ashes is worth about $5.00. 



