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New expressions for the diffraction elastic constants are presented for a cubic polycrystal that is statistically homogeneous, isotropic and disordered. The results are an extension of the theory of statistical continuum mechanics and differ from a previous derivation given by Bollenrath, Hauk, & Mfiller [Z Metallkde (1967), 58, 76-82].

£^t j 3t j These Proceedings contain research papers, discussions thereon, and panel discussions for the conference on "Fundamental Aspects of Dislocation Theory," held under the auspices of the Institute for Materials Research, April 21-25, 1969, at the laboratories of the National Bureau of Standards, Gaithersburg, Maryland. Approximately 75 contributed papers and two panel discussions are included. Topics covered are Dis-