14 THE NASAL ACCESSORY SINUSES IN MAN 



by sectioning in the various planes, the majority being hori- 

 zontal. The skulls were evidently those of middle-aged 

 individuals, but the exact ages could not be obtained. 



Thus the total number of cases studied was 145, or 290 

 lateral nasal walls and accessory sinus areas. The speci- 

 mens in each case were prepared by sectioning and dissecting, 

 so that the nasal cavities and all accessory sinuses on each 

 side could be thoroughly examined. 



