SUMMARYA number of types of organisms has been dried on cellulose fibres and recoveries have been measured after periods of 3–6 years of storage at room temperature and at 37°C. Mixtures of peptone and glucose and peptone and sorbitol have proved effective preserving agents for desiccates stored at room temperature but ineffective for storage at 37°C. Peptone alone was much more satisfactory than the mixtures at the higher temperature.A method for routine preservation of bacteria is described.