. Dr. Evans' How to keep well; . o cough whenyou remove wax from the ears. 3. From the upper back part,of the mouth and nose—a trunkline frequently used. 4. From the back part of thetongue down the windpipe to thevocal cords. This trunk line keepsthe windpipe clean. 5. From the lower windpipeand lungs. This trunk line keepsthe smaller air tubes clean andgives air a right of way. 6. From the heart—a littleused wire. 7. From the esophagus —usually a dead wire. 8. From the stomach—gener-ally a useless trouble maker. Any irritation along any of these lines may result in a cough. If theirritation c
. Dr. Evans' How to keep well; . o cough whenyou remove wax from the ears. 3. From the upper back part,of the mouth and nose—a trunkline frequently used. 4. From the back part of thetongue down the windpipe to thevocal cords. This trunk line keepsthe windpipe clean. 5. From the lower windpipeand lungs. This trunk line keepsthe smaller air tubes clean andgives air a right of way. 6. From the heart—a littleused wire. 7. From the esophagus —usually a dead wire. 8. From the stomach—gener-ally a useless trouble maker. Any irritation along any of these lines may result in a cough. If theirritation comes in over Trunk Line 4 or 5 it means that somewhere in an airpassage something has got in the tube and an effort is being made to clear itout. When the message comes in over Line 5 it means that the lungs aretrying to help themselves. The lungs have but this one way to cry. Theyhave but few ordinary nerves—nerves to register heat, or cold, or there is pain in the chest it is in the chest wall or pleura. 40. Fig. 15.—Looking Down the Windpipe fromAbove, Showing Vocal Cords. Glottisclosed—half open—wide open. COUGH 41 If the small bronchials send in a complaint that there is pus and mucusin the way and that air is being kept out the coughing center sends down amuscle impulse. A cough results and the offending pus is moved out of theway. A cough that brings something up is helpful. We divide coughs, there-fore, into those that are helpful and those that are useless. Helpful coughsare to be encouraged; useless coughs are to be discouraged. Eight there is the keynote to the treatment of coughs. The old styleplan was to take something for a cough/ to take the same thing for everycough. That something usually was an opium mixture. Often this practiceworked out this way: The lungs sent up a message, Send me a cough to clearthe airways. The answer was a dose of opium, which cut the telephone wiresand left the lungs floundering. USELESS COUGHS A cough that do
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