. The development of the chick; an introduction to embryology. Birds -- Embryology. 220 THE DEVELOPMENT OF THE CHICK states that, after this connection is estabhshed, the amniotic fluid coagulates in alcohol, "just like the fluid in the albumen- sac; owing, presumably, to the presence of albumen which has found its way through the perforations into the amniotic ; This observation is confirmed by Fiilleborn. The AUantois. The part of the w^all of the allantois that fuses with the chorion may be called the outer wall; the remainder of the sac of the allantois constitutes the inne
. The development of the chick; an introduction to embryology. Birds -- Embryology. 220 THE DEVELOPMENT OF THE CHICK states that, after this connection is estabhshed, the amniotic fluid coagulates in alcohol, "just like the fluid in the albumen- sac; owing, presumably, to the presence of albumen which has found its way through the perforations into the amniotic ; This observation is confirmed by Fiilleborn. The AUantois. The part of the w^all of the allantois that fuses with the chorion may be called the outer wall; the remainder of the sac of the allantois constitutes the inner w^all. The distal intermediate part of the allantois is specialized as the wall of the albumen-sac. AlIC. jSliS. Fig. 129. — Twelfth day of incubation. The conditions represented in Fig. 128 are more advanced. The albu- men-sac is closing; its connection with the cavity of the amnion by way of the sero-amniotic connection will be obvious. The inner wall of the allantois has fused extensively with the anmion. The umbilicus of the yolk-sac is much reduced, and some yolk protrudes into the albumen (sac of the yolk-sac umbilicus). In the outer wall there are three layers, viz., an internal epi- thelial laver, formed bv the entoderm of the allantois; a thick very vascular middle or mesodermal layer, formed by fusion of the mesoblast of allantois and chorion; and a thin, outer, ecto- dermal laver derived from the 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 Lillie, Frank Rattray, 1870-1947. New York, Holt
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