Archive image from page 35 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 18 THE DEVELOPMENT OF THE CHICK The shell-membrane consists of two layers, a thick outer layer next to the shell and a thinner one next the albumen. Both are composed of matted organic fibers (more delicate in the inner than in the outer layer), crossing one another in all directions. At the blunt end of the egg the two layers are separated and form a chamber containing air that enters after the egg is laid (Fig. 2). The physical characte
Archive image from page 35 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 18 THE DEVELOPMENT OF THE CHICK The shell-membrane consists of two layers, a thick outer layer next to the shell and a thinner one next the albumen. Both are composed of matted organic fibers (more delicate in the inner than in the outer layer), crossing one another in all directions. At the blunt end of the egg the two layers are separated and form a chamber containing air that enters after the egg is laid (Fig. 2). The physical characteristics of the albumen are too well known to require description. A dense layer inmiediately next BJ ML. A12,. VM. YK Fig. 2. — Diap;rain of the hen's egg; in section to show relations of the parts. A. C, Air chamber. Alb., Albumen. Bl., Blastoderm. Chal., Chalaza. I. S. M., Inner layer of the shell membrane. L., Latebra. N. L., Neck of Latebra. N. P., Nucleus of Pander. O. S. M., Outer shell membrane, p'v. s., Perivitelline space. 8., Shell. V. M., Vitelline membrane. W. Y., White yolk. Y. Y., Yellow yolk. to the vitelline membrane is prolonged in the form of two spirally coiled opalescent cords towards the blunt and narrow ends of the egg respectively; these are the chalazae, so called from a fanciful resemblance to hail stones. The two chalazse are twisted in opposite directions. In a hard-boiled eg it is possible to strip off the albmuen in concentric s])iral layers from left to right from the broad to the small end of the egg.
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