File:Elements of biology; a practical text-book correlating botany, zoology, and human physiology ((c1907)) (21053476398).jpg

Title: Elements of biology; a practical text-book correlating botany, zoology, and human physiology
Identifier: elementsofbiolog00hunt (find matches)
Year: (c1907) ((c10s)
Authors: Hunter, George William, 1873-1948
Subjects: Biology
Publisher: New York, American book company
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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MAMMALS 309
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Skull of a porcupine, a rodent. Notice the large overlap- ping incisor teeth. Compare with teeth of dog (see page 313). molars in your own mouth. Do you find teeth of any other shape than those just described? Compare the position and shape of the eye with that of your own. Is the eye protected in any other way than by posi- tion ? Note the bony eye socket in the skull, the lids (number), and any other adaptations. Touch the eye very lightly and see the third or "wink- ing" eyelid (the nictitat- ing membrane). Notice the shape and position of the external ear. Compare with the head in length. The external ear collects the sound waves and sends them into the internal ear, the true organ of hearing (see page 421). Test the animal's response to sounds, especially when the maker of the sound is hidden. Is the hearing of the rabbit acute? (The above problem makes a good series of home experiments.) Notice the mobility of the nose, especially when the animal is sniffing. By means of some strongly smelling substances, determine whether the rabbit easily perceives odors. Try to determine whether the saying that the whiskers of a cat or rabbit are used to smell with has any foundation in fact. Notice whether the hairs move at the same time the odor is presented. Skeleton.—The rabbit is provided with a bony skeleton which gives support to the muscles and also protects the delicate organs of digestion, res- piration, etc., under the ribs. Compare with the skeleton of man in this respect (see page 372), The bones of the skele- ton may be divided into two groups as in man, — those of the axial skeleton, the vertebrae, and bones of the head; and those of the append- ages, including the pec- toral and pelvic arches, where the appendages are attached to the axial

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