. Outlines of zoology. Zoology. Fig. 2i8.—Stages in development of Chick. (After Marshall.) 1. Segmentation, superficial view of blastoderm. 2. Vertical section of blastoderm ; , ; , lower layer of cells ; , seg- mentation cavity ; y., yolk. 3. Diagrammatic surface view; , area pellucida; , area opaca ; , neural groove ; , primitive streak. 4. Diagrammatic surface view at later stage; ap., area pellucida; , area opaca; , mesoblast segments ; , primitive streak. 5. Cross section ; , spinal cord ; , rudiment of spinal ganglia ; ^V., notoc
. Outlines of zoology. Zoology. Fig. 2i8.—Stages in development of Chick. (After Marshall.) 1. Segmentation, superficial view of blastoderm. 2. Vertical section of blastoderm ; , ; , lower layer of cells ; , seg- mentation cavity ; y., yolk. 3. Diagrammatic surface view; , area pellucida; , area opaca ; , neural groove ; , primitive streak. 4. Diagrammatic surface view at later stage; ap., area pellucida; , area opaca; , mesoblast segments ; , primitive streak. 5. Cross section ; , spinal cord ; , rudiment of spinal ganglia ; ^V., notochord ; , mesoblastic plates ; , aorta ; avi., amnion fold. 6. Embryo ; C(^., cerebellum ; /^.,ear; //"., heart ;_/;/., fore limb ; ,\\mAX\mh\ , stalk of cut-off yolk sac ; Al., allantois ; E., eye ; c, 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 Thomson, J. Arthur (John Arthur), 1861-1933; Newbigin, Marion I. (Marion Isabel), 1869-1934; Smith, Preserved, 1880-1941. fmo. New York, D. Appleton & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
