English:
Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library
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Text Appearing Before Image:
DEVELOPMENT. 201 The blood-vessels ramify in all directions through the yolk, making it a spongy mass, and all perform the same office; it is not till the fourth or fifth day that arteries can be distinguished from veins, by being thicker, and by carrying blood only from the heart.111
Text Appearing After Image:
Fig. 169.—Embryo in a Hen’s Egg during the first five days: A, hypoblast; B, lower layer of mesoblast; C, upper layer of mesoblast and epiblast united, in the last figures forming the amniotic sac; D, vitelline membrane; e, thickened blastoderm, the first rudiment of the dorsal part (in the last figure it marks the place of the lungs); hk, heart; a, b, its two chambers; c, aortic arches; m, aorta; 2, liver ; p, allantois.'
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