Schneider put an end to the idea that nasal mucus originated in the pituitary. He demonstrated anatomically and clinically that the mucous membrane lining the nose (“Schneider’s membrane”) is the source of nasal discharge, and discussed the tonsils, and ocular and lachrymal mucosa in the same way. As a result of his work the ancient doctrine of catarrhal diseases was overthrown, and the olfactory processes were definitely classified as cranial nerves. In Liber tertius (1661) Schneider was also the first to document the adenoid. (Robert J. Ruben, "The adenoid: Its history and a cautionary tale," The Laryngoscope, 127, June 2017, S13-28).