Abstract
Large nymphs of the German cockroach have been exposed to ionizing radiation at two similar Cobalt-60 sources. The insects received dosages ranging from 100r-9600r. A number of effects of these total body irradiations became apparent shortly after exposure, and are described. Data are given on mortality occurring at the 6400r and 9600r levels, on male and female sterility at 3200r, and on the progressive decrease in numbers of reproductive females, offspring per egg case and normal ovarioles at the lower dosages. Dissections of both normal and irradiated males and females, showing visible effects of irradiation on the ovaries, testes and on spermatogenesis, are also described. An explanation of the decrease in reproductivity and the occurrence of sterility is made on the basis of the probable presence of dominant lethals and on information obtained from dissection.
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