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This monograph on pleural, pericardial and peritoneal pain is an example of what careful observation, an inquisitive mind and ingenuity can do in the realm of clinical research. Many students can well remember how Capps used to tickle, as it was then termed, the pleural surfaces and study the localization of pain after he had noticed that in the course of an aspiration the patient complained of pain in the shoulder over the region of the trapezius. Following the clue obtained at the time, Dr. Capps ingeniously devised a method of determining sensitivity and localizing it by inserting a silver wire with one end dull, the other sharp, into the respective cavities through an aspiration needle, into the pleural, pericardial and peritoneal cavities. He confirmed some of the information already known and placed on a definite and sound basis the facts that the inner two thirds of the diaphragm is
An Experimental and Clinical Study of Pain in the Pleura, Pericardium and Peritoneum.. JAMA. 1932;99(13):1107. doi:10.1001/jama.1932.02740650065031