Among the numerous changes in the sea-urchin egg which have been shown by various workers to occur at the time of and subsequent to fertilisation none have attracted more attention than that of increased permeability. R. S. Lillie (1916) showed that fertilisation or artificial activation by means of butyric acid causes the eggs of Arbacia to swell more rapidly when placed in hypotonic sea water. He concluded from his experiments that the surface of the sea-urchin egg becomes more permeable to water as the result of activation.
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A. D. Hobson (1932) studied this question.
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