Abstract
Summary
The effect of direct irradiation with X-rays on mitoses in cultures of rabbit's bone-marrow was investigated. The X-rays in all doses applied (250, 500, 1000, 2500, 5000 r units) produced at first a profound decrease in the number of mitoses. In cultures irradiated with doses of 1000 r units and less the decrease in mitoses was followed by complete recovery of the mitotic activity. The recovery of mitoses in cultures irradiated with 2500 r units and more was only incomplete and the irradiation resulted in aplasia of the bone marrow.
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