LABORATORY INSTRUMENTS AND GLASSWARE--NAMELY, GLASS BEAKERS, BOTTLES, BULBS, BURETTES, CHROMATOGRAPHIC APPARATUS, COLUMNS, CONDENSERS, CRUCIBLES, CYLINDERS, DISTILLATION APPARATUS, EVAPORATORS, EXRACTION APPARATUS, FILTERS, FLASKS, FUNNELS,GAUGES JOINTS, MANOMETERS, [ NITROMETERS, ] PIPETTES, STIRRERS, STOPCOCKS, STOPPERS,TESTING APPARATUS, THERMOMETERS, TEST TUBES AND TUBING, AND FILTERS, ADAPTERS, CLAMPS AND FIXTURES FOR USE WITH SAID GLASSWARE