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aboral end aboral piece amount Annelids aquarium become positively heliotropic blastoderm blastula brain c.c. of sea-water cells cent central nervous system Cerianthus changes chromatophores Ciona intestinalis cleavage spheres contained Copepods creep Ctenolabrus determined direct sunlight dish effect embryo experiments extraovate fact formation formed gastrula geotropic grow growth heart helio hydrogen Hydroids intensity irritability lack of oxygen large number larvae later living matter longitudinal ments minutes NaCl negatively heliotropic negatively heliotropic animals normal sea-water nucleus observed occur oral end oral piece oral pole organs orientation oxygen vacuum phenomena Planarians plants pluteus Polygordius Polygordius larvae polyps positively heliotropic animals progressive movements protoplasm rays of light reaction red glass refrangible rays regeneration remained room side roots segmentation solid bodies source of light spermatozoa stage stem stimulus substances surface temperature tentacles test-tube tion tube Tubularia upward ventral vertical vessel window side worms