Abstract
Cultures of the 8-9 day choroid or sclerotic of fowl embryos were subjected to continuous (6 hr.) or to discontinuous (1 hr. per day on 6 consecutive days) irradiation ([gamma] rays) from 300 mgm. radium (as sulphate) at 0.5 cm. distance. To test effects, sub-cultures were made every 48 hrs. after irradiation. In both cases, manifestation of the lethal effect was delayed. The 18 cultures given continuous irradiation survived to the 4th-8th ex-plantation after irradiation, the average being 6.1 sub-cultivations; those given discontinuous irradiation (20 cultures) also survived to the 4th-8th, the average being 6.0; the difference seems not significant.

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