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Rats, anesthetized with sodium pentobarbital, given 900 roentgens of x-radiation over the entire body, survived more than 130 days when the radiation was given in the morning. The same dosage killed all the animals within 13 days when the radiation was given at night.

Livers in anesthetized rats were exposed t o 1.90 mHz, 60 mW/cm2 (spatial average) continuous wave ultrasound for five minutes. Subsequent mitotic activity was stimulated by partial hepatectomy. About thirty hours following stimulation (the time of peak mitotic activity in control animals), exposed animals had mean mitotic indices ranging from 20 t o 80% of control values.