National Eclectic Medical Association quarterly . Plate II.—Antero-posterior section of skull, to left of nasal sep-tum. 1—Probe passed into left sphenoidal sinus; 3, 4—Eight and leftsphenoidal sinuses; 5—Frontal sinus; 6—Ostium maxillare. Thin plateof bone between sphenoidal sinuses, sella turcica and optic Plate III.—Section of frontal bone seen from below, showing roofof orbits (floor of frontal sinuses), probe laid across in median —Eight frontal sinus; 2—Left frontal sinus. Sinuses are asymmetricalwith complete septum bowed to left.

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