180 MASS. EXPERIMENT STATION BULLETIN 155. 



No. 12. Lime Refuse from Manufacture of Lactic Acid. 

 No. 13. Lime Refuse from Bleachery Filter Bed. 

 No. 14. Lime Refuse from Tannei-j'. 



Analysis. 



Lime Refuse from Manufacture of Lactic Acid {JS'o. 12). — 

 Lime refuse from the maniifacture of lactic acid would not be 

 a fit material to use agriculturally until mixed with 200 or 300 

 pounds of limestone per ton of refuse. The raw product car- 

 ries nearly one-half of one per cent, of free sulfuric acid, which 

 would probably injure vegetation unless neutralized by the 

 limestone. The value of the product would not be over $2 to 

 $3 per ton at the farm. After receiving the application of lime- 

 stone the product should be used the same as land plaster or 

 gypsum, as most of the lime is present as sulfate. 



Lime Refuse from. Bleachery Filter Bed (Xo. 13). — This 

 particular sample contained practically all of its lime in the 

 form of carbonate. It gave only a slight reaction for chlorides. 

 In ordinary practice it would be well to apply the material 

 during late fall and allow it to remain exposed until spring, 

 so that any injurious lime compounds that might be present 

 would have a chance to oxidize before being mixed with the 

 soil. It may be used in quantities up to 2 tons per acre on 

 land in neeil of lime. 



Lime Refuse from Tannery (No. IJf). — Most of the lime 

 in this sample was present as hydrated or slaked lime. The 

 product carries nearly one-half of one per cent, of arsenic 

 (AS2O5). If the product be used in moderate quantities (2 

 tons per acre) this amount of arsenic would probably not prove 



