Abstract

Mitotic and degenerate cell counts were made on the eye and brain of frog tadpoles exposed to three different doses of α rays and the results compared with those already known for a small dose of γ rays. Whereas with the lowest α-ray dose the relation between mitosis and degeneration does not differ from that which would be expected to follow a relatively small dose of radiation, after the two larger α-ray doses degeneration far exceeds this amount. It would seem that α rays cause the degeneration of potential dividing cells in considerable numbers.

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