The average survival time after bilateral adrenalectomy of rats of the N. I. M. R. hooded strain, maintained on a low salt diet and not having visible accessory tissue, was about 6 days. This survival time was usually too short to permit the establishment of an effective graft, but by feeding NaCl it could be prolonged sufficiently to enable fresh cortical tissue to form grafts which were functional in that the animals survived subsequent transference to low salt diet for 2 weeks. Exposure of the cortical tissue to low temperatures by the methods previously employed for ovarian tissue (Parkes & Smith 1953) greatly decreased the probability that it would form an effective graft, but a number of successful experiments were carried out, especially when a buffered Ringer-Locke medium containing glycerol was substituted for the glycerol-saline previously used. In all, more than a hundred functional grafts were obtained from adrenocortical tissue which had been exposed to a temperature of — 79°C for up to 24 h. Adrenocortical cells, therefore, like many others, are not necessarily destroyed by exposure to low temperatures ( — 79°C), though it seems that optimal conditions are not provided by the technique evolved for gonadal endocrine cells.