Diseases of the nose and throat . rd and upward until it meets the body of the bone at some pointwhere at length adhesions take place. The tube thus formed linedwithin and without by mucous membrane eventually becomes sealedat its extremities. Distention of this cavity goes on until theglandular elements in its lining membrane undergo absorption frompressure. The last explanation must certainly be considered rather CHRONIC RHINITIS. 45 fanciful. The developmental theory of etiology is accepted by PaysonClark, who professes to have found no evidences of inflammatoryaction in four cases of conch

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Diseases of the nose and throat . rd and upward until it meets the body of the bone at some pointwhere at length adhesions take place. The tube thus formed linedwithin and without by mucous membrane eventually becomes sealedat its extremities. Distention of this cavity goes on until theglandular elements in its lining membrane undergo absorption frompressure. The last explanation must certainly be considered rather CHRONIC RHINITIS. 45 fanciful. The developmental theory of etiology is accepted by PaysonClark, who professes to have found no evidences of inflammatoryaction in four cases of concha bullosa operated upon by himself, andwho has discovered in literature only four cases accompanied by pusformation. On the other hand J. Wright points out the presence ofosteoblasts building up bone on the outside of these cysts whileosteoclasts are absorbing it within. Thus a preexisting cavity be-comes larger and larger as a result of a low grade of osteitis. Thesecysts are very common, Zuckerkandl having found them thirty-six. I1F;

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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectnose, bookyear1903