Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 218
ynx of M.Czermak upon a screen in this room, but with only partialsuccess. The organ may, however, be viewed directly inthe laryngoscope; its motions, in singing, speaking, andcoughing, being strikingly visible. It is represented atrest in fig. 107. The roughness of the voice in colds is I owe it… … due, according to Helmholtz, to mucous flocculi, which get into the slit of the glottis, and which are seen by means of the laryngoscope. The squeaking falsetto voice with which some persons are afflicted, Helmholtz thinks, may be produced by the drawing aside of the mucous layer which ordinarily…
Sound
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