THE THEORY OF MITOGENETIC RADIATION

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Abstract
Exposure of photographic plates to actively growing onion roots through 0.2 mm. quartz for 48 hrs. failed to detect any effects of a mitogenetic radiation. Similar exposures of photographic plates to actively growing yeast cultures through quartz 1.1-1.8 mm. thick for as long as 89 days yielded only negative results. Evidence is also offered to show that the onion root cannot be relied on as a detector of the mitogenetic rays, since in normal roots, unexposed to any supposed source of mitogenetic radiation, there may still be a variation in the number of dividing cells in the 2 halves of a root as high as 50%. It is concluded in view of their negative evidence that the existence of a mitogenetic radiation in the form of u.-v. light by normally growing onion roots and yeast plants cannot be accepted as a fact.

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