Abstract
The experiments here recorded had three main objects :— ( a ) To investigate the effects of X-rays upon chick embryos of different ages irradiated in ovo (Part I). ( b ) To discover how far the destructive effect of radiation upon the tissues is due to a direct action of X-rays upon the individual cells, and how far it may be attributed to an indirect action resulting from physiological disturbance in the organism (Part II). ( c ) To determine if possible the nature of such indirect action (Part III). The authors are indebted to the Medical Research Council, by whom the expenses of these investigations were defrayed.
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