This study is prompted by a certain amount of dissatisfaction with the results of operations on the ethmosphenoid sinuses and a consequent confusion, at times, as to the best method to be followed. The brilliant results reported by enthusiastic advocates of the external operation, such as Sewall,1 Ferris Smith2 and Simpson,3 make one doubt the advisability of the intranasal procedure. Yet I am certain that many surgeons still prefer to operate intranasally, reserving the external approach for cases obviously demanding it. Often the patients prefer this method, agreeing to it when they would hestitate to accept an external operation. Earlier training, together with a natural desire to avoid subjecting the patient to more than is necessary, makes one try out the intranasal operation first. Indeed, the late Robert Lynch4 in describing his external approach, said, "When all else fails, try this." Possibly his words have been