Licence: Public Domain Mark
Credit: On deformities of the chest / by William Coulson. Source: Wellcome Collection.
Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.
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![exercise the pressure, soon learn to exercise it during the time of expiration, and to suspend it, so as to allow the breast to develope itself, during the moment of inspiration. During these movements, a sound is heard similar to that made by the air in alternately entering and escaping from a bellows. I have often attentively observed the immediate effects of this exercise : these effects are a flattening of the projection of the sternum, a greater or less bending outwards of the ribs, the momentary return of the chest to a more natural shape, respiration much more strong and perfect than in general, [but what does he add ?] and, when the pressure is removed, the imme- diate return of the parts to their ordinary state, accom- panied with a strong inspiration. These pressures should be repeated ten times—a hundred times a-day if it were possible, and continued for several minutes each time : their efficacy will be in proportion to their frequency and duration. The reader will observe, that I give this method](https://iiif.wellcomecollection.org/image/b21047674_0034.jp2/full/800%2C/0/default.jpg)
