We have recently reported (Nelson and Brooks, 1933) that infra-red light of wavelengths of approximately 1μ, interfered with successful formation of fertilisation membranes by subsequently inseminated eggs of Urechis caupo and two species of Strongylocentrotus. We now show that this injury is still traceable in the rate of cleavage of the fertilised eggs of Urechis, but that gradual recovery, or some process which simulated it, takes place both before and after insemination.

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