. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 196 CUMrAEATlVE ZOOLOGY. causing tlie blood to flow backward and forward. The tube is gi'adually bent together, until it forms a double cavity, resembling the heart of a Fish. On the fourth day of incubation, partitions begin to grow, dividing the cavities into the rio-ht and left auricles and A. A Fios. 1C3-167.—Embryo in a Hen's Egg during the first five days: A, mucous layer; B, vascular layer; C, blastoderm, or serous membrane, in the last figure forming the amniotic sac ; D, vitelline
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 196 CUMrAEATlVE ZOOLOGY. causing tlie blood to flow backward and forward. The tube is gi'adually bent together, until it forms a double cavity, resembling the heart of a Fish. On the fourth day of incubation, partitions begin to grow, dividing the cavities into the rio-ht and left auricles and A. A Fios. 1C3-167.—Embryo in a Hen's Egg during the first five days: A, mucous layer; B, vascular layer; C, blastoderm, or serous membrane, in the last figure forming the amniotic sac ; D, vitelline membrane ; c, thickened blastoderm, the first rudi- ment of the dorsal part (in the lust figure it marks the place of the lungs); h, heart: «, 6, its two chambers: o braucMal arteries; w, aorta; i, liver; p, al- 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 Orton, James, 1830-1877. New York, Harper and brothers
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
