1. The theory which Crowther has advanced to account for the variation of the lethal dose of roentgen rays among the individuals of a group of Colpidium colpoda is reviewed.
2. It is shown that the use of his small-body theory to explain the small value of λe leads to certain further assumptions about the nature of the destructive effect.
3. An alternative hypothesis is discussed.
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Copyright, 1927, by The Rockefeller Institute for Medical Research
1927
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