. The germ-cell cycle in animals . Cells. Fig. 37. — Calligrapha. A. A germ cell of C, multipunctata shortly after being cut off from the egg. B. Division of a primordial germ cell. C. Longitudinal section through egg of C. higsbyana at blastoderm stage; the posterior end was killed with a hot needle just after deposition. D. Longitudinal section through uninjured egg at same stage. E. Two ectoderm cells (e), two mesoderm cells (m), and two germ cells {) from an egg three days old. F. Germ cellduringmigrationinto the embryo (three days old). Longi- tudinal sections through eggs cent
. The germ-cell cycle in animals . Cells. Fig. 37. — Calligrapha. A. A germ cell of C, multipunctata shortly after being cut off from the egg. B. Division of a primordial germ cell. C. Longitudinal section through egg of C. higsbyana at blastoderm stage; the posterior end was killed with a hot needle just after deposition. D. Longitudinal section through uninjured egg at same stage. E. Two ectoderm cells (e), two mesoderm cells (m), and two germ cells {) from an egg three days old. F. Germ cellduringmigrationinto the embryo (three days old). Longi- tudinal sections through eggs centrifuged for one hour, two hours, and four hours respectively, bl = blastoderm; = granules of pole-disc ; h = killed portion of egg ; khbl. = keimhautblastem; p. = posterior; pgc = primordial germ cells ; v = vitellophags ; = vesicular zone ; y. = 5' 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 Hegner, Robert William, 1880-1942. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1914
