. 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. 296 EARLY DETERMINATION IN DEVELOPMENT originate from materials other than the normal material. The paper by Holtfreter (1944), showing that action of several chemi- cal and physical agents bring about the same results, supports the interpretation of the liberation of
. 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. 296 EARLY DETERMINATION IN DEVELOPMENT originate from materials other than the normal material. The paper by Holtfreter (1944), showing that action of several chemi- cal and physical agents bring about the same results, supports the interpretation of the liberation of evocating substances from ab- normal Fig. 6. Petromyzon larvae, head reconstruction: A, control; B, Li+- treated larva; a habenular ganglia; b, first branchial pouch; c, notochord; e, epiphysis; f, pharynx; 1, otocyst; m, midbrain; n, olfactory organ; p, plica rhombo-mesencephalica; pr, forebrain; r, hindbrain; x, protuberance of chiasma; Vi, first trigeminal ganglion; V,, second trigeminal ganglion; VII, facialis; IX, glossopharyngeus; X, vagus. (From Ranzi and JaneseUi, 1941.) The Petromyzon embryos seem to react to Li+ and SCN" just as the amphibians. LiCl-treated embryos are described by Ranzi and JaneseUi (1941) (Fig. 6). NaSCN-treated embryos showed large notochord and hind-brain enlargements (Ranzi, 1945). This field is open to further research. The lithium chloride-treated embryos of an ascidian {Ciona. 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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