Sp0zimcns for microscopic examinations wcrc polishcd with O.OS~rm AI,O, powder, and photomicro graphs of tbc polished sections were obtained without etching. The size of ZnO grains of the second series spccimcns was dctcrmincd by multiplying 1.5 to average linear intercepts [15] on about 300 500 grains of each specimen. The volume fraction of liquid phase was also dctcrmincd by the usual point counting method.