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The minute anatomy Of the nasal accessory sinuses and their relations to the Optic nerves have now engaged my attention for a period of ten years. The results I have Obtained provide an anatomical basis for the study; of visual disturbances and blindness, associated with disease Of the accessory sinuses, and especially with disease of the posterior ethmoidal cells and the sphenoidal sinuses. An accurate study Of the pathological anatomy of this subject is still required. TO this and to accurate clinical Observation we must look for the filling up of the numerous gaps in our knowledge Of this subject. To my honoured colleagues I pass on the result Of these researches, in the hope that it may stimulate others to pursue this important subject to a successful issue, both through Ophthalmic and rhinological research. My illustrations have been reproduced from photographs, natural size. I demonstrated ten Of the Specimens at the Thirty-third Ophthalmological Congress, held at Heidelberg in 1906. Eight Speci mens reproduced in my atlas, The Accessory Sinuses of the Nose.