The origin of vesicular breathing was attributed by Laennec to friction of the inspired air in the bronchioles and its entrance to the infundibula from the bronchioles. This inflammation was sanctioned by such masters as Skoda and Wintuch and remained unquestioned, so far as I am able to learn, until Baas attempted to explain on purely acoustic grounds the improbability of any audible sound originating in tubes the size of the bronchioles from the passage of a current of air with the slow velocity which must attend the entrance of inspired air in the vesicles of the lung. Baas' article published in the Deutsche Arch. für Klin. Medicin, vol. xix, 1876, is a profoundly thoughtful and logical discussion of the subject which was well calculated to carry conviction to the mind of the reader. I was greatly impressed with the acute reasoning of the author the first time I read
HOOVER CF. THE ORIGIN OF THE VESICULAR RESPIRATORY SOUND. JAMA. 1902;XXXIX(13):766–767. doi:10.1001/jama.1902.52480390032002e
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