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v.v., the vitelline veins. al., the allantois. Figure 2. Chick about sixth day. Figure 3. Development of heart. Figure 4. Development of the eye. Figure 5. Chick about the sixteenth day. A.M. is the amnion surrounding the embryo. Note particularly how the allantois (al.) has spread over surface of shell and how the yolk sac is shrivelled. Figure 6. Figures to illustrate the relative function and importance of allantois and yolk sac in bird and mammal. In the fowl, however, the blood-vessels of the allantois also probably absorb the albumen of the egg, and may excrete urea into the egg-space. Figure 7. Simplified figure of the embryonic circulation, for comparison with the similar figures annexed to Dog-Fish and Rabbit. {Lines from Second Edition only.} [A.C., anterior cardinal. Ao., Aorta. Br4, sixth aortis arch (fourth branchial). C.S. Cuvierian sinus. H., the heart. I.C., inferior cava. P.C., posterior cardinal vein. Tr.A., truncus arteriosus. v.v., vitelline vein.] Figure 8. Chick on the nineteenth day. {Illustration: Diagram Sheet 24.} ***END OF THE PROJECT GUTENBERG EBOOK TEXT BOOK OF BIOLOGY, PART 1: VERTEBRATA*** ******* This file should be named 21781.txt or 21781.zip ******* This and all associated files of various formats will be found in: http://www.gutenberg.org/dirs/2/1/7/8/21781 Updated editions will replace the previous one--the old editions will be renamed. Creating the works from public domain print editions means that no one owns a United States copyright in these works, so the Foundation (and you!) can copy and distribute it in the United States without permission and without paying copyright royalties. Special rules, set forth in the General Terms of Use part of this license, apply to copying and distributing Project Gutenberg-tm electronic works to protect the PROJECT GUTENBERG-tm concept and trademark. Project Gutenberg is a registered trademark, and may not be used if you charge for the eBooks, unless you receive specific permission. If you do not charge anything for copies of this eBook, complying with the rules is very easy. You may use this eBook for nearly any purpose such as creation of derivative works, reports, performances and research. They may be modified and printed and given away--you may do practically ANYTHING with public domain eBooks. Redistribution is subject to the trademark license, especially commercial redistribution.
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