Market Conditions; The Validity of Employment Contracts; Development of South Australian Copper and Oil Resources; Glauber's Salt from the Caspian Sea; British Board of Trade; Potash Deposits in Spain; China Clay; Production of Zinc; Concrete Plugs in Mines; Tungsten Market in Great Britain; The Need for Petrol Substitutes; Hardened Filter Paper; Borneol from Waste Sulfite Liquor; The World's Coal Supply