Identifier: journalofmorphol20wist (find matches)
Title: Journal of morphology
Year: 1909 (1900s)
Authors: Wistar Institute of Anatomy and Biology
Subjects: Morphology Physiology
Publisher: Boston : Ginn & Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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unincubated blastoderm. Fig, 52 showsthe entoderm and part of the ectoderm above, and a free nucleus at n lyingon the floor of the cavity, which contains many small granules, x 688. Fig. 53. It shows two small nucleated cells (at s and s), which aredoubtless wandering entoderm cells. There are also ma^ny large yolkmasses in the cavity, x 500. Fig. 54. This shows the result of the operation in Experiment VI. Theinjury was made thirty-five hours after fertilization, and the egg then incu-bated for forty-eight hours. There are twelve pair of mesoblastic somitespresent, the development being slightly retarded, x 20. Fig. 55. This shows a large multinucleated yolk mass, in which most ofthe nuclei are degenerating, x 500. Fig. 56. This shows the result of the operation in Experiment X. Theinjury was made on an unincubated blastoderm, and the egg was then incu-bated for twenty-three hours. The embryo is normal in every way. X 25. AbiKULATION IN THE PiGEONS EGG. J. Thos. Patterson. Plate VII.
Text Appearing After Image:
Journal of Morphology—Vol. XX, No. 1. Plate VIII. Fig. 57. Transverse section through the injured head-fold of the embryoshown in Fig. 59. The main group of injured cells is at op. X ^^^ Fig. 58. Transverse section through the injured region of the eml)ryoshown in Fig. 60. The needle has destroyed a considerable portion of theprimitive streak material, and has also disturbed the underlying entoderm.The folding of the lateral poitions of the entoderm is an artifact, x 95. Fig. 59. This embryo was operated on thirty-four and one-third hoursafter fertilization, and then incubated for thirty-four hours. The injury,\^riS made in. the center of the dorsal lip at a distance from the posteriormargin equal to about half the width of the needle (see Fig. XVI, a). Pos-terior to the head fold the embryo is normal in every way. x 21. Fig. go. The operation was performed on a freshly laid egg, w^hich wasthen incubated for twenty-six and three-fourth hours. The injury wasmade on the boundary betwe

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