On account of the irregularity in shape and uncertainty of size, location and communication of the accessory cavities of the nose, the diagnosis of the exact cavity or sinus involved in the acute stage of inflammation is frequently impossible. In the subacute or suppurative stage the diagnosis is not often difficult. Time will not be taken to refer in detail to these irregularities. The recent original research and publications made by Cryer of Philadelphia, B. Douglas of New York and Turner of London, have added greatly to our knowledge of the minute anatomy, and to them we are indebted for knowledge that enables us to deal radically and successfully with these pathologic conditions.
Attention is briefly called to the meati of the nasal cavities because the accessory sinuses communicate through them to the nasal chamber. These sinuses, or air chambers, both on anatomic and clinical grounds, are divided into two