. Elementary principles of agriculture; a text book for the common schools. absorbs the sugar and albumen from thesolution used in our early experiments. (H 9a.) 324. Digestive Tract of Domestic Animals. Thereare important difierences in the digestive tracts of theseveral classes of domestic animals, such that eachis adapted to the different classes of substances uponwhich they feed and thrive. 325. Digestion by Fowls. Birds swallow their foodwhole without chewing. It passes first into the crop,where it is stored and softened by soaking. (Fig. 159 I.)Then it passes into the thick-walled, muscu
. Elementary principles of agriculture; a text book for the common schools. absorbs the sugar and albumen from thesolution used in our early experiments. (H 9a.) 324. Digestive Tract of Domestic Animals. Thereare important difierences in the digestive tracts of theseveral classes of domestic animals, such that eachis adapted to the different classes of substances uponwhich they feed and thrive. 325. Digestion by Fowls. Birds swallow their foodwhole without chewing. It passes first into the crop,where it is stored and softened by soaking. (Fig. 159 I.)Then it passes into the thick-walled, muscular stomachor gizzard. The gizzard is supplied with powerful (235) 236 Elementary Principles of Agriculture muscles which breakThis is greatly aidedswallow. 326. Herbivoroususually be eaten inneeded nutrients. Inis not only of a greatchambered stomach, up the food eaten by the fowls,by the sharp gravel which fowls Animals. Vegetable food must greater quantity to furnish the herbivorous animals the intestine length, but often has a large and furnishing a large laboratory. ^Ig. 159. Stomachs of some domestic animals. I, Crop and gizzard of , glandular stomach; C, gizzard. II. Interior of horse stomach showingthe two kinds of lining. A, left sac with tough white lining; B, rightsac with soft red lining -vhere the digestive juices are secreted; E,duodenum. III. Stomach c ox as seen from right upper face (Chauveau),and IV, Stomach of sheep with second, third and fourth divisions , oesophagus; B Rumen, or first division of stomach; C, reticulum; D,omasum; E, abomasum, or true stomach; F, duodenum. Nutrition of the Animal Body 237 in which the digestive processes may be carried the stomach of the horse, which is comparativelysmall, two regions may be distinguished, of which onlythe right or second part secretes digestive juices. 327. Ruminating Animals. In cattle and all split-hoof animals, the stomach has four more or less distinctcompartments. (Fig. 159 III and IV
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