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Effects of ethylurethane, phenobarbital, chloralose and morphine on the survival of rats in 145 mm Hg (altitude of about 12km.) were studied at 8° to 20°C.1. The mean survival time of control rats and the confidence limit was 1.9±1.6min.(P=0.001).2. The survival time of rats administered with ethylurethane, 0.05 to 1.0g/kg., was prolonged; over 60min. in the majority of cases.3. The survival time of rats administered with phenobarbital, 0.05 to 0.2g/kg., was similarly prolonged, though accompanied with a certain inhibition of respiration.4. With chloralose (0.1g/kg.), half of the rats survived over 30 min. Respiration was strongly inhibited.5. With morphine, no increased survival was observed.

EFFECTS OF SUBNARCOTIC DOSES OF ETHYLURETHANE ON RESISTANCE TO SEVERE ANOXIA IN RATS