A method for making display quality glass sheets comprising: melting batch materials in a furnace to produce molten glass; fining the melted batch materials in a finer; forming a glass ribbon from the fined, molten glass; and separating glass sheets from the ribbon; wherein: (a) the furnace has an internal surface, a portion (33, 34) of which contacts molten glass; (b) said portion (33,34) of the internal surface that contacts molten glass comprises ZrO 2 as its major constituent; (c) the melting of step comprises employing a plurality of electrodes to pass electrical current through the molten glass; (d) each of the plurality of electrodes comprises molybdenum as its major constituent; (e) molten glass leaves the furnace and enters the finer at a rate R, where at steady state, R satisfies the relationship: R ≥ 907 kg/hour (2,000 pounds/hour); and (f) at steady state, the glass sheets produced in step are characterized by: (i) the glass making up the glass sheets is an alumina-silicate glass; (ii) the average content of ZrO 2 in the glass sheets satisfies the relationship: ZrO 2 ≤ 0.1, where [ZrO 2] is in weight percent on an oxide basis; (iii) the average content of MoO 3 in the glass sheets satisfies the relationship: 0 < MoO 3 ≤ 0.002, where [MoO 3] is in weight percent on an oxide basis; and (iv) prior to removal of any unacceptable glass sheets, a population of 50 sequential sheets has an average level of solid defects plus gaseous defects of a size greater than 100 micrometres that is less than or equal to 0.013 defects per kg (0.006 defects per pound of glass), where each of the glass sheets has a thickness that is less than or equal to 2.0 millimeters and a weight of at least 4.5 kg (10 pounds) and (g) the furnace comprises a bottom wall and side walls and the plurality of electrodes pass through the bottom wall and are spaced from the side walls. melting batch materials in a furnace to produce molten glass; fining the melted batch materials in a finer; forming a glass ribbon from the fined, molten glass; and separating glass sheets from the ribbon; (a) the furnace has an internal surface, a portion (33, 34) of which contacts molten glass; (b) said portion (33,34) of the internal surface that contacts molten glass comprises ZrO 2 as its major constituent; (c) the melting of step comprises employing a plurality of electrodes to pass electrical current through the molten glass; (d) each of the plurality of electrodes comprises molybdenum as its major constituent; (e) molten glass leaves the furnace and enters the finer at a rate R, where at steady state, R satisfies the relationship: R ≥ 907 kg/hour (2,000 pounds/hour); and (f) at steady state, the glass sheets produced in step are characterized by: (i) the glass making up the glass sheets is an alumina-silicate glass; (ii) the average content of ZrO 2 in the glass sheets satisfies the relationship: ZrO 2 ≤ 0.1, where [ZrO 2] is in weight percent on an oxide basis; (iii) the average content of MoO 3 in the glass sheets satisfies the relationship: 0 < MoO 3 ≤ 0.002, where [MoO 3] is in weight percent on an oxide basis; and (iv) prior to removal of any unacceptable glass sheets, a population of 50 sequential sheets has an average level of solid defects plus gaseous defects of a size greater than 100 micrometres that is less than or equal to 0.013 defects per kg (0.006 defects per pound of glass), where each of the glass sheets has a thickness that is less than or equal to 2.0 millimeters and a weight of at least 4.5 kg (10 pounds) and (i) the glass making up the glass sheets is an alumina-silicate glass; (ii) the average content of ZrO 2 in the glass sheets satisfies the relationship: ZrO 2 ≤ 0.1, where [ZrO 2] is in weight percent on an oxide basis; (iii) the average content of MoO 3 in the glass sheets satisfies the relationship: 0 < MoO 3 ≤ 0.002, where [MoO 3] is in weight percent on an oxide basis; and (iv) prior to removal of any unacceptable glass sheets, a population of 50 sequential sheets has an average level of solid defects plus gaseous defects of a size greater than 100 micrometres that is less than or equal to 0.013 defects per kg (0.006 defects per pound of glass), where each of the glass sheets has a thickness that is less than or equal to 2.0 millimeters and a weight of at least 4.5 kg (10 pounds) and (g) the furnace comprises a bottom wall and side walls and the plurality of electrodes pass through the bottom wall and are spaced from the side walls.