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Strain aging in silver chloride single crystals containing a few parts in 105 polyvalent metal impurity has been studied over the temperature range -12° to 51°C. At room temperature, the aging process requires of the order of half an hour to go to completion. The measured activation energy for the aging rate is 0.46±0.06 eV. The maximum stress increment due to aging decreases with increasing temperature with an effective activation energy of 0.1 eV. On the basis of the kinetics of the process, it is demonstrated that the dislocation pinning giving rise to strain aging is due to the migration to the dislocations of the impurity ions themselves rather than the vacancies they introduce. Sharp upper yield points have been observed; they are discussed in terms of current concepts of dislocation multiplication and unpinning.