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Image from page 413 of "First course in biology" (1908) | by Internet Archive Book Images
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Image from page 413 of "First course in biology" (1908)

Identifier: courseinbiobailfirstrich

Title: First course in biology

Year: 1908 (1900s)

Authors: Bailey, L. H. (Liberty Hyde), 1858-1954 Coleman, Walter Moore, 1863-1926

Subjects: Biology

Publisher: New York : The Macmillan Company

Contributing Library: University of California Libraries

Digitizing Sponsor: MSN



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Text Appearing Before Image:

176 A.XIMAL BIOLOGY shape to enable the body to penetrate the air, and a smallneck would destroy the conical form. The internal organsare compactly arranged and rest in the cavity of the breastbone. The bellows-like air sacs filled with warm airlighten the birds weight. The bones are hollow and verythin. The large tail quills are used by the bird only inguiding its flight up and down, or balancing on a limb. The feet also aid aflying bird in bal-ancing. The wingis so constructed asto present to theair a remarkablylarge surface com-pared with thesmall bony supportin the wing skele-ton. Are tubesever resorted to byhuman architects when lightness combined with strengthis desired ? Which quills in the wing serve to lengthenit? (Fig. 296.) To broaden it? Is flight more difficultfor a bird or a butterfly ? Which of them do the flyingmachines more closely resemble? Can any bird fly for along time without flapping its wings ?


Text Appearing After Image:

Fig. 322.— Herring Gull. (Order?) Exercise in the Use of the Key. — Copy this list and write the nameof the order to which each of the birds belongs. (Key, page 177.) Cockatoo (Fig. 320) Wren (Fig. 310) Pheasant (Fig. 319) Sacred Ibis (Fig. 328) Apteryx (Fig. 318) Wood Duck (Fig. 314) Screech Owl (Fig. 311) Lyre bird (Fig. 327) Jacana (Fig. 324) Nightingale (Fig. 325) Road Runner (Fig. 313) Sea Gull (Fig. 322) Top-knot Quail (Fig. Ostrich (Fig. 332) Heron (Fig. 315) 329) Penguin (Fig. 330) Hawk (Fig. 312) BIRDS 177 KEY, OR TABLE, FOR CLASSIFYING BIRDS {Class Aves)INTO ORDERS Aj Wings not suited for flight, 2 or 3 toesAj Wings suited for flight (except the penguin)B[ Toes united by a web for swimming, legs shortCj Feet placed far back ; wings short, tip not reaching to base of tail (Fig. 300)C, Bill flattened, horny plates under margin of upper bill (Fig. 323)C3 Wings long and pointed, bill slenderC4 All four toes webbed, bare sac underthroatB., Toes not united by web for swimmingC



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