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alloys aluminum American atomic weight Beery Biology Business Manager calcium calcium carbide carbon dioxide cell cellulose cent Century of Progress Chem chemical Chemical Synthesis chemist Chemistry Club Chemistry Leaflet chloride Club Number Clubs of America cobalt College Colloid color Company compounds containing copper Courtesy electric electrons element exhibits Family fibers furnace glass gold graphite heat helium High School hydrogen important industry interesting iodine iron laboratory lead light liquid magnesium Manganese manufacture material ment mercury metal method mineral nickel nitrate nitrocellulose nitrogen oxide oxygen particles Pauline G Pennsylvania Pennsylvania State College phosphorus Physics plant platinum potassium pounds powder production Progress Exposition proteins Public School Number radium Research salt Science Leaflet selenium sodium solution steel Student Science Clubs substance sulfuric acid tellurium temperature tion tons tube U. S. Number United Volume World Trade Notes York zinc