I present the reader with a new sign, which I have discovered for detecting diseases of the chest, This consists in the percussion of the human thorax, whereby according to the character of the particular sounds thence elicited, an opinion is formed of the internal state of that cavity.

New Invention by Means of Percussing the Human Thorax for Detecting, Signs of Obscure Disease of the Interior of the Chest, December 31, 1761