On the Use of Drosophila melanogaster as a Tool in the Study of Delayed Killing by X-Rays

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Abstract
A detailed study is given of certain morphol. and physiol. modifications occurring in various stocks of D. m. under x-irradiation. "Delayed killing" under heavy dosages is considered at some length from a study (1) of statistical data on the number of eggs deposited, the number of larvae alive at a specified time after treatment, the number of pupae formed by x-rayed larvae and finally the number of emergent flies. (2) of information derived from the behavior of imagines preparing to leave the pupa case, behavior of living flies developing from x-rayed larvae and microscopic examination of the flies after death, and (3) of information derived from examination of the contents of pupa cases which failed to produce flies. A marked difference in sensitivity to x-rays is found between larval and imaginal tissue during larval life.

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