George M. Gould,
Anomalies and Curiosities of Medicine
“ The physiologic explanation of sword-swallowing is quite interesting. We know that when we introduce the finger, a spoon, brush, etc., into the throat of a patient, we cause extremely disagreeable symptoms. There is nausea, gagging, and considerable hindrance with the function of respiration. It therefore seems remarkable that there are people whose physiologic construction is such that, without apparent difficulty, they are enabled to swallow a sword many inches long. Many of the exhibitionists allow the visitors to touch the stomach and outline the point of the sabre through the skin. ”
