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From day 5 to 14 infant jj rats were subjected to increasing periods of either superblue phototherapy (8 twenty watt fluorescent bulbs, 1 to 5 hours per day depending on age) or darkness. Half of each litter was assigned to each group(N=84 and 82 respectively). Pups in litters of 6 received no supplement while separated from the mother; those in litters of 8 received 5% glucose, 25 cc/K. Temperature and humidity were controlled. Nursing dams were fed high fat breeder chow (11%) to insure an abundant milk supply. A statistically significant decrease in brain damage was achieved without evident ill effect. See Table.