. Animal physiology. Physiology, Comparative; Physiology, Comparative. STRUCTURE OF THE BIRD'S EGG. ;) 7 a store of pure albumen, commonly termed the white of the egg (Fig. 283, g), which is gradually absorbed into the volk-basr. Fig. 283.—Section of a Bjrd's Egg. <t, cicatricula ; b, yolk-bag ; c, membrane lining shell; d, attachment of chala^ae; e, chalazae; /, air space; g, albumen. when its own store is exhausted. This is deposited upon its surface, whilst it is passing through the oviduct; and from the lining of this canal seems to be poured out the liquor sanguinis, which, by i
. Animal physiology. Physiology, Comparative; Physiology, Comparative. STRUCTURE OF THE BIRD'S EGG. ;) 7 a store of pure albumen, commonly termed the white of the egg (Fig. 283, g), which is gradually absorbed into the volk-basr. Fig. 283.—Section of a Bjrd's Egg. <t, cicatricula ; b, yolk-bag ; c, membrane lining shell; d, attachment of chala^ae; e, chalazae; /, air space; g, albumen. when its own store is exhausted. This is deposited upon its surface, whilst it is passing through the oviduct; and from the lining of this canal seems to be poured out the liquor sanguinis, which, by its coagulation, forms the beautiful fibrous membrane, that encloses the white, and is also the basis of the shell (§. 23). This membrane separates into two layers at the large end of the egg; and, enclosed between these, there is a bubble of air, /, which serves to give the young bird, just before it is hatched, the power of filling its lungs with air. The yolk-bag floats within the albumen, and always tries to take the highest place, being the lighter of the two; but it is kept nearly to one place, by two cords, which seem formed of peculiarly viscid albumen, and con- nect the yolk-bag with the lining membrane at the two ends of the shell, d, d. These are termed the chalazm (0, e). In this manner, the yolk-bag is always kept at the part of the shell where it can most favourably receive the warmth imparted to it by the mother; and the cicatricula or germ-spot (which is the mass of cells first developed within the germinal vesicle) is made, by a similar contrivance, always to rise to the highest 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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Keywords: ., bookauthorcarpenterwilliambenja, bookcentury1800, bookdecade1840
