60 CHEMICAL FERTILIZERS 



Salmang, " Ammonia Production by the Gasification of Coal and Coke 

 in the Presence of Steam and Air," Journ. Soc. Chem. Ind., 1919, p. 452 A. 



Roscoe and Schorlemmer, " Treatise on Chemistry," p. 842 (Mac- 

 mi llan). 



Sommer, " Increasing the Yield of Ammonia in Coal Distillation," 

 Journ. Soc. Chem. Ind., 1919, p. 350 A. 



Harger, " Coal and the Chemistry of its Carbonization," Journ. Soc. 

 Chem. Ind., 1914, p. 389. 



Fortsall, " Recent Improvements in Gas Manufacture," Journ. Soc. 

 Chem. Ind., 1914, p. 400. 



Christopher, " Progress in By-product Recovery at Coke Ovens, "Journ. 

 Soc. Chem. Ind., 1913, p. 115. 



Butterfield, " Gas Manufacture " (Griffin). 



Lunge, " Coal Tar and Ammonia " (Gurney & Jackson). 



Bone, "Coal and its Scientific Uses"; p. 277 (gas making), p. 317 

 (direct recovery), p. 360 (Mond gas) (Longmans). 



Perkin, " By-products from Peat," Journ. Soc. Chem. Ind., 1914, p. 395. 



" Calcium Carbide Residue for Liming," Journ. Bd. Agric., 1915-16, 

 pp. 699 and 1289. 



" Waste Lime from Acetylene Manufacture," Journ. Bd. Agric., Jan., 

 1919, p- 1203. 



Crowther and Ruston, " Effect upon Vegetation of Atmospheric 

 Impurities," Journ. Agric. Soc., iv., p. 25. 



Knecht and Hibbert, " Products Isolated from Soot," Journ. Soc. Chem. 

 Ind., 1914, p. 302. 



Cohen and Ruston, "Soot: its Character and Composition," Journ. 

 Soc. Chem. Ind., 1911, p. 1360. 



"Ammonia from Coal," Journ. Soc. Chem. Ind., 1919, p. 331 R. 



