Among the functions subserved by the nares in the respiratory process are the heating of the inspired air and the addition of watery vapor, as well as the filtration of particles of solid matter. If this mechanism be deranged from any cause, infection is likely to take place, with resultant catarrhal disturbances and impairment of hearing in case of extension to the Eustachian tube. If nasal breathing be obstructed, especially in children, only imperfect expansion of the lungs can take place and deformity of the chest results. A certain amount of adenoid tissue is present normally in the nasopharynx of healthy children, but an excess appears to cause effects apart from the obstruction of breathing to which this gives rise. The mouth-breathing child with adenoids not alone presents a dull, stupid look, but it also seems intellectually below the average, and it is usually stunted in general growth. The improvement
THE INFLUENCE OF DEFECTIVE NASAL BREATHING ON GROWTH AND DEVELOPMENT. JAMA. 1906;XLVI(21):1617–1618. doi:10.1001/jama.1906.02510480045009
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