. Elementary biology, animal and human. Biology. 134 ANIMAL BIOLOGY d. How are the delicate gill filaments protected from injury? If the same water remained on the gills for some time, what changes in the relative amount of oxygen and car- bon dioxid in the water would occur ? Why, then, is it necessary that a current of water should pass over the gills ?. 3J I I â¢c\t,Vv\ /-/-â /- \c c;A IIJ_ cw^. 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 resemb

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. Elementary biology, animal and human. Biology. 134 ANIMAL BIOLOGY d. How are the delicate gill filaments protected from injury? If the same water remained on the gills for some time, what changes in the relative amount of oxygen and car- bon dioxid in the water would occur ? Why, then, is it necessary that a current of water should pass over the gills ?. 3J I I â¢c\t,Vv\ /-/-â /- \c c;A IIJ_ cw^. 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 Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1912