Diseases of the chest and the principles of physical diagnosis . are correct in this assumption we have no means of determining bypercussion with which of the diverse types of pulmonary consolidationwe are deahng. Percussion is also used to outline the boundMries of organs whenneighboring ^dscera possess different phj^sical quahties, as for instancethe heart and the lung. The most brilliant triumphs of topographicpercussion are manifested when unrhythmic ^-ibrations Twhich remain 88 THE EXAMINATION OF THE LUNGS more or less localized) are set up, and when the tissues directly under-lying the p
Diseases of the chest and the principles of physical diagnosis . are correct in this assumption we have no means of determining bypercussion with which of the diverse types of pulmonary consolidationwe are deahng. Percussion is also used to outline the boundMries of organs whenneighboring ^dscera possess different phj^sical quahties, as for instancethe heart and the lung. The most brilliant triumphs of topographicpercussion are manifested when unrhythmic ^-ibrations Twhich remain 88 THE EXAMINATION OF THE LUNGS more or less localized) are set up, and when the tissues directly under-lying the point of percussion yield different vibrations than the neighbor-ing structures, , in the normally distended healthy lung. We canaccurately outline the heart or the liver from the lung since they havevery different vibratory qualities, but not the liver from the heart, sincetheir acoustic properties are much the same. Neither can we be accuratein differentiating between the stomach and the colon, owing to their Resonant Slight dulness Flat (absolutedulness). Tympany High-pitchedtympany Fig. 78.—lllustratiug the different percussion sounds normally obtained on the rightanterior and the lateral aspects of the chest, as well as the anatomic reasons therefor.(Compare Fig. 88.) vibratory similarity, nor can we accomplish much in outlining a tumor ofthe intestine because rhj^thmic vibrations (tympanitic sounds) are setup, which cannot be localized. The Sense of Resistance.—Hard and soft are terms which we applyto objects according as their parts are displaceable with difficulty or withease. We derive our judgments from the pressure sense of the skin andthe muscle sense. Thus we speak of a board-like resistance, which weare accustomed to meet with in massive consolidations. The attributes which give us the impression of hardness or softness METHODS AND RESULTS OF PERCUSSION 89 depend essentially, first, upon the elasticity of the percussed object. Themore elasticity, the greate
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