Show einck coal smoke there Is it seems a great deal more than carbon in black coal smoke pro fessor E knecht analyzed the coot soot from manchester coal smoke and at a lecture in london he be exhibited the results of 0 his analysis among them were acro snow white samples of ammonium gium chloride ammonium sulphate calcium sulphate and a beautifully crystallized paraffin hydrocarbon similar in properties and composition to a substance present in beeswax the boot soot also contained 13 per cent of heavy hydrocarbon oils 1 from rom some of tho the products professor knecht prepared a brown which produced absolutely fast shades on cotton |