Annealing experiments on the thermal acceptors quenched into germanium by rapid cooling from high temperatures are used to deduce information about vacancies and interstitials in germanium. Annealing is studied at a series of temperatures and a critical temperature is found at 516°C. Above 516°C, the annealing curves suggest a bimolecular recombination process implying that the heat treatment produces comparable numbers of vacancies and interstitials (Frenkel defects) which disappear by mutual annihilation. Below 516°C, the data can be explained by a model in which interstitials are trapped near dislocations before much recombination can occur with vacancies. As a result of these experiments and their interpretation, interstitials are believed to be more mobile than vacancies below, and possibly above, 516°C.