THE pH OF THE BLASTOCŒLE OF ECHINODERM EMBRYOS

Abstract
Solutions of indicator dyes (Clarke and Lubs series) were micro-injected into the blastocoele of echinoderm embryos (Arbacia, Asterias, Echinarach-nias) at various stages of development. If injections are made without injuring the embryos, the colorimetric value of the p H of the blastocoele is always the same as that of the surrounding sea-water. Susceptibility to injury of the wall of the blastula and the archenteron of the pluteus would account for the low ph recorded by previous investigators for these stages.

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