. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. 96 ANIMAL PHYSIOLOGY. formed, but its curvature becomes more marked and of auricles arise; while outside the embryo itself the circula- tion of the yelk-sac is established, the allantois originates, and the amnion makes rapid progress. It may be noticed that the cerebral vesicles, the optic vesi- cles, and the auditory pit are all derived from the epiblastic accumulations which occur in the anterior extremity of the embryo; and their ear
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. 96 ANIMAL PHYSIOLOGY. formed, but its curvature becomes more marked and of auricles arise; while outside the embryo itself the circula- tion of the yelk-sac is established, the allantois originates, and the amnion makes rapid progress. It may be noticed that the cerebral vesicles, the optic vesi- cles, and the auditory pit are all derived from the epiblastic accumulations which occur in the anterior extremity of the embryo; and their early appearance is prophetic of their physi- ological importance. The heart, too, so essential for the nutrition of the embryo, by distributing a constant blood-stream, is early formed, and. 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 Mills, Wesley, 1847-1915. New York, D. Appleton
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