Monochromatic Ultra-Violet Radiation as an Activating Agent for the Eggs of Arbacia Punctulata

A method for the effective irradiation of Arbacia eggs with measured quantities of monochromatic ultra-violet radiation is described. 2. The activation (parthenogenesis) of Arbacia eggs by polychromatic and monochromatic radiation is demonstrated. 3. The energy requirements and wave-length dependence of activation have been worked out. The wave-lengths most effective are in the shorter ultra-violet. 4. The wave-length dependence of the activation curve of Arbacia is compared with the inactivation curves for urease and the virus of typical tobacco mosaic.