By means of measurement of CO2 respiratory rates it has been possible to observe immediate and latent effects of x-ray irradiations upon Drosophila larvae. The observations were extended over a period of several days, the duration of the prepupal period being observed also. In every instance a significant decrease in the rate of CO2 respiration was observed immediately after irradiation. This decrease was univariant with the period of irradiation within the experimental limits.

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