. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 202.—Digestive apparatus of a Fig. 203.—The gizzard of a goose granivorous bird : cr, crop; fv, cut open : tp, triturating pad. proventriculus ; g, gizzard ; i, in- (After Owen.) testine. each with a cushion or pad, which rub against one an- other (Fig. 203). The cavity is small and lined with a hard, almost horny skin. Gravel is taken as grinders to this mill, and renewed as required. The whole pro- cess is briefly as follows: The food is first stored and insalivated and sof
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 202.—Digestive apparatus of a Fig. 203.—The gizzard of a goose granivorous bird : cr, crop; fv, cut open : tp, triturating pad. proventriculus ; g, gizzard ; i, in- (After Owen.) testine. each with a cushion or pad, which rub against one an- other (Fig. 203). The cavity is small and lined with a hard, almost horny skin. Gravel is taken as grinders to this mill, and renewed as required. The whole pro- cess is briefly as follows: The food is first stored and insalivated and softened in the crop. The crop acts as a hopper to the gizzard mill, dropping little by little as required. The digestive juice secreted by the proven- triculus is also added little by little as required. The triturated and digested material finally passes on to the intestines. Evolution of this Apparatus.—This elaborate ap- paratus is most perfect in grain-eating birds ; but all grades approaching it may be found in birds from the simple thin sac of the flesh-eating to the powerful mill of the 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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