AUSCULTATION AND PERCUSSION.
Laennec invented the stethoscope and perfected his discoveries in the physical diagnosis of the diseases of the heart and lungs, in 1816.
Avenbrugger published his work on Percussion in 1761.
One hundred and fifty years before Laennec’s suddenly conceived act of applying a roll of paper to the breast of a female patient gave birth to thoracic acoustics, that ingenious and philosophic man, Robert Hooke, said in his writings:—
“There may be a possibility of discovering the internal motions and actions of bodies by the sound they make. Who knows, but that as in a watch we may hear the beating of the balance, and the running of the wheels, and the striking of the hammers, and the grating of the teeth, and a multitude of other noises,—who knows, I say, but that it may be possible to discover the motions of internal parts of bodies, whether animal, vegetable, or mineral, by the sounds they make?—that one may discover the works performed in the several offices and shops of a man’s body, and thereby discover what engine is out of order, what works are going on at several times and lie still at others, and the like? I have this encouragement not to think all these things impossible, though never so much derided by the generality of men, and never so seemingly mad, foolish, and fantastic, that as the thinking them impossible cannot much improve my knowledge, so the believing them possible may perhaps be an occasion for taking notice of such things as another would pass by without regard as useless, and somewhat more of encouragement I have from experience that I have been able to hear very plainly the beating of a man’s heart; and it is common to hear the motion of the wind to and fro in the intestines; the stopping of the lungs is easily discovered by the wheezing. As to the motion of the parts one among the other, to their becoming sensible they require either that their motions be increased or that the organ (the ear) be made more nice and powerful, to sensate and distinguish them as they are; for the doing of both which I think it is not impossible but that in many cases there may be HELPS found.”