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This work has been awarded the Casselberry prize by the American Laryngological Association. It is a scholarly presentation of the use of radiopaques in sinus study in which the author gives in much detail his method of replacing the air in the paranasal sinuses by radiopaque substances. The author demonstrates the use of these substances in a study of the anatomy of the sinuses and claims for this method valuable aid in the diagnosis of sinus disease as well as in the treatment for sinus disorders. The claim is made that a failure to fill the sinus by his displacement method is an important aid in diagnosing sinus disease; also delay in emptying a sinus in which radiopaque substances have been introduced is claimed to have important clinical significance. The author insists that irrigation of a sinus previous to the introduction of radiopaques is not permissible, and he states that