. The diseases of poultry. Poultry. rately molded to the inequalities of the ribs and the spaces between the ribs. Notwithstanding these resemblances to the sluggish cold-blooded animals, the bird's breathing apparatus is of the highest order of excellence, and wonderfully effective. The lungs are comparatively small and have little elasticity, but there is a compensation for these features in the free communication with the spacious air sacs which contain an abundant supply of air. The upper opening of the tr.;chea or windpipe is on the floor of the mouth just behind the tongue. The larynx at
. The diseases of poultry. Poultry. rately molded to the inequalities of the ribs and the spaces between the ribs. Notwithstanding these resemblances to the sluggish cold-blooded animals, the bird's breathing apparatus is of the highest order of excellence, and wonderfully effective. The lungs are comparatively small and have little elasticity, but there is a compensation for these features in the free communication with the spacious air sacs which contain an abundant supply of air. The upper opening of the tr.;chea or windpipe is on the floor of the mouth just behind the tongue. The larynx at the beginning of the windpipe, which is such a perfect structure in the higher mammals, is in birds only slightly developed. The edges of the larynx ap - pear to close together so perfectly that no epiglottis or lid is necessary. There are no vocal cords in the larynx as in mammals, and therefore this organ cannot produce voice, and it only raises or lowers a note by bringing together or separat- ing the stiff margins of the opening. The true organ of voice in birds is the lowerlarynx or syrinx, which is. Fiff. 1.—Luiifrs of a Bird. A.—Lower Surface. B.— Upper 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 Salmon, D. E. Washington, D. C. , G. E. Howard & co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpoultry, bookyear1899
