Outlines of comparative anatomy

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Seite 306 - The bills of birds differ much, according to their different habits, and particularly according to the kind of food on which they are destined to live, and the manner in which they are to seek it. In birds of prey, the...
Seite 180 - ... the sympathetic nerves, appropriated to the more slow and regular movements of organic life, form a more isolated system, and these three systems are developed together, almost from the lowest animals '." The following literary history, from Dr.
Seite 308 - ... appendices, which open into its sides throughout its whole course, and which appear to perform the office of stomachs in receiving and preparing the food. In the simplest forms of animalcules however, (as in the monas atónita represt nted in Jig.
Seite 308 - ... his predecessors in unfolding the structure of the digestive organs of animalcules. Such coloured organic matter, diffused as fine particles mechanically suspended in the water in which animalcules are placed, is readily swallowed by them, and renders visible, through their transparent bodies, the form and disposition of their alimentary cavities ; but, however long they remain in these coloured infusions with their stomachs...
Seite 308 - ... disposition of their alimentary cavities; but however long they remain in these coloured infusions, with their stomachs distended with the colouring matter, it is not perceived to communicate the slightest tinge to the general cellular tissue of their body. In most of the animals of this class there is an alimentary canal with an oral and an anal orifice, which traverses the body and is provided with numerous small round...
Seite 399 - The bills of eagles and vultures, hawks and owls, and other rapacious birds, are strong, short, compressed, arched, curved at the point, dense in their texture, and with sharp cutting edges, to seize, and tear, and cut the flesh of living prey.
Seite 204 - ... is seen in the highest Crustacea, while yet in their embryo condition in the ovum. In the short and broad trunk of the Cymothoa, where the legs are still equally developed along the sides of the body, the nervous columns (Fig. 367) have already approximated to touch each other on the median plane, and the ganglia on the two sides have coalesced to form a single chain along the middle of the abdominal surface of the body. The ganglia are still nearly equidistant, and equally developed along the...
Seite 21 - ... be effected by the addition of calcareous matter only to the proximal extremity, or fixed ends of the spines. The lines of growth do not then converge and meet in longitudinal sections, but diverge and terminate at the sides of the spines. This structure is seen in the spines of Cidaris pistillaris. The compact portion of the spine formed within the capsule is seen occupying the middle of its whole extent; and the successive layers of growth are observed extending from this central portion to...

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