Carpenter's principles of human physiology . hem : noting theprincipal differences that have been observed in the process as it occurs in thehigher class.* A newly-laid hens egg consists of a shell (Fig. 326, s), * In the following account, Foster and Balfours Elements of Embryology has beentaken as a guide, and to this excellent work the student is referred for details that considera-tions of space preclude from being here inserted ; but other works and researches which maybe studied are those of Eathke, On the Deveiopment of the Snake, 1839, and of the Tor-toise, 1848—of Kolliker (Midlers Ar
Carpenter's principles of human physiology . hem : noting theprincipal differences that have been observed in the process as it occurs in thehigher class.* A newly-laid hens egg consists of a shell (Fig. 326, s), * In the following account, Foster and Balfours Elements of Embryology has beentaken as a guide, and to this excellent work the student is referred for details that considera-tions of space preclude from being here inserted ; but other works and researches which maybe studied are those of Eathke, On the Deveiopment of the Snake, 1839, and of the Tor-toise, 1848—of Kolliker (Midlers Archiv, 1843, p. 68) andBagge (DeEvolut. Strongyliet Ascarid., Diss. Inaug., 1841) on the ova of JEntosoa,—Ivollikers Entwickelungs-geschichte des Menschens, 1879,—those of v. Baer, On the Development of the Fish, 1835,—those of Newport ( Philos. Transact., 1851) and Duges ( Recherches sur les Batraciens,1835) on the ova o\,Batrachia,—those of Bischoff ( Entwickelungsgeschichte des Hundes- 910 of generation:—EMBRYONIC composed of an organic basis impregnated with calcic salts, and perforated byvertical canals, through which an interchange of gases can take place. Theshell is lined by two layers of membrane (Fig. 326, s m, i s m), which earlyseparate from each other at the broad end to form the air-chamber. Beneath the shell membraneis the white of theegg, or albumen (, w); and stretch-ing from near the twoextremities of the eggto the opposite sur-faces of the yolk, aretwo twisted portionsof rather firmer al-bumen, termed thechalazce (ch, Z), whichperhaps serve to keepthe yolk in yolk is enclosedin the vitelline mem-brane (vt), and by farthe largest portionof it is composed ofyellow yolk (yy), Diagrammatic Section of an Unincubated Fowls Egg. II, blastoderm; which consists of w, y, white yolk. This consists of a central flask-shaped mass and a number onhpT-po ripvpr rnn- of layers—the halones—concentrically arranged around
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
