A year ago, I proposed to the members of the American Laryngological Association that 60 per cent, and conceivably 80 per cent, of patients with paranasal sinus disease would show some form of dental caries in the antral bony floor. I had investigated 152 consecutive antral cases with rather special reference to the subjacent teeth. The matter was difficult of proof, but it seemed reasonable to conclude that if there was an abscessed tooth just under a suppurative maxillary sinus and if the dental infection in all probability antedated the sinus infection, one might consider the trouble to have originated in the tooth. In that case, as the condition became more advanced, the infection would pass
from the tooth to the antrum, to the ethnoid sinuses and perhaps to the frontal sinuses, being carried there by blowing or by the slower process of membranous degeneration and change. Table