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The effect of particle‐size variations on the detonation velocity of the two‐component solid explosive, Composition B, has been studied at various diameters and shown to be important. An attempt has been made to apply the diameter‐effect theory of Eyring and that of Jones to explain the experimental data, but without complete success. Certain particle‐size effects in Composition B have been shown to persist to infinite diameter, and a plausibility argument in terms of the Kirkwood‐Wood theory has been offered. The presence of large crystals in low‐density RDX has been shown to lead to a ``super velocity'' which still prevails at infinite diameter. Experiments using large spheres of Composition B have been performed which also demonstrate a ``super velocity'' which may be related to the effect found in RDX.