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Amer. J, Physiol., 1904, 12, 241--275).-The experiments mere made on the eggs of the turtle and of Fundulus, and were carried out in relation to the work of others on the influence of electrolytes and ions on development. A difference of electrical potential occurs, which increases as development progresses, between the animal and vegetative poles of the eggs. The 3.M.F. so generated undergo periodic variations during the phases of segmentation, and are doubtless related to the unstabledoi:10.1039/ca9048605826 fatcat:vpkzqzq5x5fqfho4soert7asvq