An updated account of the state of the art in the subject, presenting recent progress in two active and related areas of continuum mechanics: fracture mechanics and structured deformations.

by Noll, then scantly known, at the Carnegie Institute of Technology. An invita tional meeting on visco-elasticity in the following April at Lancaster, Pennsyl vania, brought Coleman and Noll together. In those days a person went to a meet ing so as to learn from a few competent lectures without having to be himself one more "invited speaker" or to listen to many multiples of ten minutes of trivial trash. Ericksen lectured on "laminar shear flows" of incompressible, Rivlin-Erick sen fluids. That class of flows contains all those for which Rivlin and others had obtained exact solutions....