It's not until after she dies that Scout and Jem get a sense of what's going on behind the drool and venom: Mrs. Dubose is a morphine addict who had vowed to go clean before she died, and enlisted Jem and Scout (without their knowledge) to keep her off the stuff for longer and longer periods of time.
http://lungsounds.net/rales-lung-sounds/ - Rales lung sounds are small rattling noises heard around the lung. This happens when air exposes closed air spaces. Rales can be shown as wet, dry and coarse.
1 Rales sounds will be heard on one side of the chest when you are lying down. 2  There are abnormal rumbling sounds coming from your lungs. 3  This may indicate there is sputum present in the large airways. 4  The doctor will do a percussion test wherein he will tap your chest lightly and listen to its sound.