New concepts in diagnosis and treatment : physico-clinical medicine, the practical application of the electronic theory in the interpretation and treatment of disease, with an appendix on new scientific facts . The force of thepercussion blow is always secondary to the knack ofobtaining full \ibration in resonant tissues. The stu-dent to gain flexibihty of the wrist joint should prac-tice movements of this, joint with the arm adductedtoward the thorax, and the forearm at right anglesand motionless. As already observed, the best results are secured byfinger-finger percussion; one finger acting
New concepts in diagnosis and treatment : physico-clinical medicine, the practical application of the electronic theory in the interpretation and treatment of disease, with an appendix on new scientific facts . The force of thepercussion blow is always secondary to the knack ofobtaining full \ibration in resonant tissues. The stu-dent to gain flexibihty of the wrist joint should prac-tice movements of this, joint with the arm adductedtoward the thorax, and the forearm at right anglesand motionless. As already observed, the best results are secured byfinger-finger percussion; one finger acting as a pleximeterand the other finger as a plexor. After this manner one canappreciate the resistance of tissues percussed (palpablepercussion). To localize the percussion-blow, the secondlinger (usually employed) acting as a pleximeter must be PERCUSSION 29 held rigid with the ungual phalanx slightly raised ().If the latter precaution is not taken, and the terminalphalanx rests on the abdomen, the blow will be transmittedto the contiguous area, and the tone elicited will obscurethe stomach dulness. When the raising of the ungual phalanxis difficult, a celluloid thimble may be affixed to the end of. Fig. io.—The upper figure represents the correct position of the finger whenused as a pleximeter. The cross indicates the part of the digit to be struck by theother finger acting as a plexor. The lower figure indicates the incorrect positionof the finger in eliciting dullness of the stomach. The middle figure illustrates theuse of plaster for raising the ungual phalanx when this is impossible voluntarily. the finger, thus attaining the correct position as shown infig. II. Another means of securing the same object is toraise the phalanx by aid of adhesive plaster as shown in fig. IO. To thoroughly appreciate the changes in resonance,light percussion must be employed, insomuch as it is a 30 THE STOMACH REFLEX recognized law of sense-perception that the less loud theinitial sound
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