76 CHEMICAL FERTILIZERS 



waste liquors are sprayed into an evaporator, and after 

 concentration extracted with benzine. The extracted con- 

 centrated liquors are evaporated to a dry cake, which may 

 contain 20 % potash, and can be used directly as a fertilizer. 

 Seaweed. This old-fashioned source of soda and potash 

 salts is once more coming into use. Japan claims to be 

 able to produce potassium chloride from this source at a very 

 cheap rate, under conditions which, if fully developed, would 

 yield 7000 tons of potash salts per annum. 



REFERENCES TO SECTION V. 



POTASH Ellis, " Potash in Banana Stalks and Skins," Journ. Soc. Chem. 

 Ind., 1916, pp. 456 and 521. 



Gimingham, " Waste of Sawmills as a Source of Potash," Journ. 

 Bd. Agric., 1915, p. 146. 



Russell, " Ashes of Hedge Clippings and Trimmings as a Source of 

 Potash," Journ. Bd. Agric., 1914, p. 694. 



Weston, " Recovery of Potash from Wool Scouring Waste," Journ. 

 Soc. Chem. Ind., 1918, p. 17 T. 



Migama, " Japanese Seaweeds," Journ. Soc. Chem. Ind., 1917, p- 135- 



Hendrick, " The Composition and Use of Certain Seaweeds," Jour. 

 Highland and Agric. Soc., 1898, p. 118; Journ. Bd. Agric., 1915-16, 

 P' *95 ; Journ. Soc. Chem. Ind., 1916, p. 565. 



" The Composition of Seaweed and its Use as Manure," Leaflet No. 

 254, Board of Agric. 



" The Cultivation of Seaweed in Ireland," Journ. Bd. Agric., 1915-16, 

 p. 462. 



Bryant, "A New Potash Supply," Journ. Soc. Chem. Ind., 1919. p. 

 360 T. 

 BONES " The Chemical Age," 1920, p. 50. 



