IF the ends of the fingers be struck upon the chest over the heart, a dull sound will be heard over a space from one and a half to two inches square, beginning at the fourth rib on the left side, and extending down nearly to the sixth. The dullness is diminished by lying upon the back, and increased by leaning forward, and by taking * full breath. The deadness of sound is caused by the heart being * partially solid body. The lungs which surround it yield a clear sound.
If a solid substance, as large as the heart, were placed on the inside of a drum, against. the head, only a dead sound would be obtained by striking on that spot; everywhere else, the sound would be louder.
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