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acid action added alcohol amount analysis analytical appears application Association British calculated carbon carried cent CHEMICAL chemistry chloride colour complete compounds concentration containing copper determined direct effect engineering erbium experiments fact Farringdon Street filtered further give given glass glucose Government grains grms heat important increase indicator industry Institution interest iron laboratory lead less lines London manufacture material matter means measurements Meeting metal method mixture nature necessary nickel nitrate nitrogen observed obtained Office oxide physical possible practically precipitate prepared present production Prof published pure reaction regard Research resistance salt samples separated shown Society sodium soil soluble solution specific steel Street substances sulphuric supply Table taken temperature tion United various volume weight