Transparent soaps are prepared by dissolving ordinary soap in strong alcohol and distilling off the greater portion of the alcohol till the residue comes to the condition of a thick transparent jelly.
Strong sulphuric acid in contact with it liberates first nitric acid and later oxides of nitrogen, leaving a charred residue or a brown solution according to the quantity of acid.
The fifth, and last period - which, after all other expedients had failed, finally brought the residue of uncaptured and unsurrendered burghers to submission - was the final development of the blockhouse system, wedded to the institution of systematic. " driving " of given areas, which operations were in force until the 31st of May 1902, when peace was ratified at Pretoria.
He despatched French with a large force to clear the south-eastern districts of the Transvaal and for the rest maintained a force to watch De Wet, and organized a defence force in Cape Colony, while using the residue of his mounted men to sweep the country of stock, forage and inhabitants.
The substance is heated with metallic sodium or potassium (in excess if sulphur be present) to redness, the residue treated with water, filtered, and ferrous sulphate, ferric chloride and hydrochloric acid added.