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Journal of Experimental Biology 9,238-248 (1932)
Published by Company of Biologists 1932

Iodine Compounds and Fertilisation : IV. Capacity for Fertilisation in Washed and Unripe Eggs of Echinus Esculentus and Echinus Miliaris

G. S. CARTER ¹

¹ Corpus Christi College, Cambridge.; Laboratory of Experimental Zoology, Cambridge, and the Marine Laboratory, Millport

1. The development of eggs of E. esculentus or E. miliaris which have been washed in a current of sea-water until they are becoming unfertilisable is improved by later treatment with egg-water or solutions of thyroxine in sea-water. The secretions and thyroxine improve the development of the eggs to about the same extent.

2. The improvement may be produced by egg-water of the opposite species.

3. These effects are due to action on the egg and not on the sperm.

4. The development of unripe eggs is also improved by treatment with egg-water or thyroxine.

5. None of these effects are due to variations of the hydrogen-ion concentration or osmotic pressure.