. Comparative anatomy and physiology. 164 COMPARATIVE ANATOMY AND PHYSIOLOGY. and the fibres that they give off, are very strong. We have already noted the presence of small pebbles in the gizzard ; the duty of these is to act as grinding stones. On the contraction of the muscles the cavity. B Fig. 73.—Horizontal Sections of the Gizzard of a Goose, in contraction (A) and relaxation (B). (After Garrod ; Proceedings of the Zoolo- gical Society, 1872, page 527.) of the gizzard is, of course, diminished in extent, and the food contained in it crushed against the stones. It sometimes happens that t
. Comparative anatomy and physiology. 164 COMPARATIVE ANATOMY AND PHYSIOLOGY. and the fibres that they give off, are very strong. We have already noted the presence of small pebbles in the gizzard ; the duty of these is to act as grinding stones. On the contraction of the muscles the cavity. B Fig. 73.—Horizontal Sections of the Gizzard of a Goose, in contraction (A) and relaxation (B). (After Garrod ; Proceedings of the Zoolo- gical Society, 1872, page 527.) of the gizzard is, of course, diminished in extent, and the food contained in it crushed against the stones. It sometimes happens that the lower end of one pad and the upper end of the other are respectively better developed than the rest; when this happens a slight sliding is added to the crushing movement, which must have considerable influence in breaking hard 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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