. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. y] early development of the embryo 61 plates take no part in ths rolling in to form the medullary tube, but flatten out and seem to disappear. Ziegler ('92) has made several excellent figures of living embryos of Rana temporaria (Figs. 22, 23). The first of these shows young embryos as seen from in front, so that the sense- plate is turned toward the observer (Fig. 22). A longi- tudinal groove appears in the middle of the sense-plate, and subsequently a transverse groove develops across the sense-
. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. y] early development of the embryo 61 plates take no part in ths rolling in to form the medullary tube, but flatten out and seem to disappear. Ziegler ('92) has made several excellent figures of living embryos of Rana temporaria (Figs. 22, 23). The first of these shows young embryos as seen from in front, so that the sense- plate is turned toward the observer (Fig. 22). A longi- tudinal groove appears in the middle of the sense-plate, and subsequently a transverse groove develops across the sense- plate (Fig. 22, D, E). The depression that later forms the mouth lies at the crossing-point of the longitudinal and trans-. -r. 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 Morgan, Thomas Hunt, 1866-1945. New York, The Macmillan company; [etc. , etc. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectembryology, bookyear1
