The system was investigated by well-known methods of quenching and petrographic examination.One ternary compound, 5PbO.B20 a.SiOz, was established .Over 90 percent of the system is occupied by the fi elds of PbO.2B20 a and of Si02 and these fields lie predominantly under a two-liquid area.That portion of the system containing less than 60 p ercent of PbO is in co mplet e.
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Geller et al. (1939) studied this question.