These volumes, 3 and 4, of Fracture Mechanics of Ceramics con- stitute the proceedings of an international symposium on the frac- ture mechanics of ceramics held at the Pennsylvania State Univer- sity, University Park, PA on July 27, 28, and 29, 1977. Volumes 1 and 2 were published previously as the proceedings of a sympo- sium of the same name held July 11, 12, and 13, 1973, also at Penn State. All four volumes published to date concentrate on the...