The favorable effect of a hot bath is still clearer in the observation of the general condition of the subject than in the temperature curves, although it cannot be presented objectively. The breathing very often becomes “freer” immediately upon introduction into the hot water. The hot water releases a strong stimulus; the unconscious subject often reacts with an outcry. Soon thereafter there occurs a distinct lessening of the severe rigor. The return of consciousness occurs sooner, and indeed at temperatures at which it did not usually happen under other methods of treatment. In the first experiments with hot water treatment, this was continued only for 10 minutes; after that the subjects were removed and vigorously massaged. Under these circumstances it could be established that the temperature rise continued during the rubbing, indeed in one experiment the rise became steeper. As already indicated, this favorable effect of dry rubbing was not so pronounced without preliminary treatment by heat. It is important, too, that the rubbing be done when the severe spasm of the peripheral vessels has already passed. _In view of this, the hot hath is the best method of treatment of the severely cooled person._ However, in the practice of sea rescue service it will not be possible to carry out this method, since the necessary means are not available in aircraft and boats. Under these circumstances we must consider next only the rapid rewarming with light cradle or electrically _heated sleeping bag_. Therefore a sleeping bag as now used in the sea rescue service was also tested. It was evident that the temperatures which can be developed by this means are not sufficient for heat therapy. With those it was possible to reach a temperature of only 32° C. [90° F.] over the skin, with the heat turned on fully. Besides this, the wall of the foot-section of the sleeping bag is only partly heated; on the outer sides it remains completely cold. As long as no improvement and strengthening of the heating equipment of the sack is carried out, the sleeping bag can be considered only as a substitute for wrapping in warm covers. The warming by means of the _light cradle_ is more uneven than with a hot bath. With warming by light one might expect severe local vessel expansion with _danger of collapse_. Actually the subjects often complained of dizziness and nausea after reaching consciousness if the treatment lasted longer than 15 minutes. Occasionally vomiting occurred. In these cases it is indicated to switch off the light cradle and to pack the subject with covers. Apart from this it must be remembered that during unconsciousness the subject should be protected against direct contact with the lamps by means of covers, otherwise burns could occur during clonic-tonic convulsions.