Excerpt from The American Journal of Roentgenology (Founded in 1906 as the American Quarterly of Roentgenology), Vol. 8: 1921, January to December
Although in the main, the vagus tends to stimulate and the sympathetic to inhibit the stomach and bowel, these effects are gener ... ally transient, often indecisive and not infre quently reversed. They vary with the strength of the stimulus and with the con dition of the muscle. The next objection is that the whole theory: of: nerve endings and intermediate substances is shaky. Leading pharmacologists have for some time been calling attention to the many contra dictions in the literature of the subject, and have warned us to be careful in accepting physiologic conclusions based upon the sup posed activities of the various nerve pois ons.'
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