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FLUID FILTERS, MICRO-POROUS FILTERS FOR POLISHING LIQUIDS, FILTERS FOR SEPARATING SOLIDS FROM LIQUIDS, FILTERS FOR REMOVING ENTRAINED SOLIDS FROM GASES, BACTERIOLOGICAL FILTERS, CRUCIBLES AND FUNNELS INCORPORATING A MICRO-POROUS DISC OF REFRACTORY MATERIAL, MICROPOROUS FILTER CANDLES OF CERAMIC MATERIAL, AND DISCS AND HOLLOW TUBES FORMED OF MICROPOROUS MATERIAL USED FOR FILTERING PURPOSES ALL ARTICLES BEING ESPECIALLY DEVISED FOR LABORATORY AND RESEARCH USE