. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. Fig. 4. Phalliisia tadpoles, a, development in sodium malonate; h, development in 6 X 10~2 2Vf malonate. sented some larvae which developed after the treatment. They have almost normal "heads," but the tails are very abnormal— atrophic, distorted, and po
. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. Fig. 4. Phalliisia tadpoles, a, development in sodium malonate; h, development in 6 X 10~2 2Vf malonate. sented some larvae which developed after the treatment. They have almost normal "heads," but the tails are very abnormal— atrophic, distorted, and poorly functional, with the chordal cells partially fused and randomly disposed, apparently as a conse- quence of the disturbed differentiation of the muscle-cells. The above results were obtained also when the treatment was inter- rupted at neurula stage. Treatment with Selenite. Eggs at the 2-cell stage reared in selenite solutions at 1 X 10~^ to 4 X 10"^ M can develop into larvae (Fig. 5a). The larvae from a 1 X 10~^ M solution cannot, however, get out of the membranes, their tails are poorly devel-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington
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