. Un guide de référence des sciences médicales : englobant toute la gamme des connaissances scientifiques et pratiques de la médecine et des sciences connexes. la muqueuse de thetympanum. Ils se composent d'une amende et loosestroma délicate de tissu conjonctif aréolaire, dans les mailles dont sont trouvés les piles rondes et parfois en forme de fuseau ou cellules stellaires. Il y a aussi de nombreux vaisseaux sanguins. Ces polypes sont généralement irrégulière sur la sur-face, en raison de leur structure et l'glandswhich pupillaire qu'ils contiennent, et qui, selon Schwartze, sont les inversions de l'épithélium tubulaire dans le tissueof la pol

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. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. the mucous membrane of thetympanum. They consist of a fine delicate and loosestroma of areolar connective tissue, in the meshes ofwhich are found round cells and sometimes spindle-shaped or stellate cells. There are also numerous blood-vessels. These polypi are usually irregular on the sur-face, owing to their pupillary structure and the glandswhich they contain, and which, according to Schwartze, are tubular inversions of the epithelium into the tissueof the polypus. These growths frequently contain cysts, which arelined by cylindrical epithelium and filled with a mucousfluid, in which are found loose epithelial cells and mu-cous corpuscles. Steudener regards them as retention-cysts, produced from the tubular glands. The epithelium covering the surface of the polypus, which is exposed directly to the external air, is usuallyof the pavement variety, while on the unexposed, or in-ner surface, there is usually found cylindrical epithe-lium or ciliated cylindrical epithelium. (Fig. 4229.). Fig. 4229.—Cross Section of a Mucous Polypus, covered with ciliated cy-lindrical epithelium. (From a drawing by Dr. Ira Van Gieson.) Politzer says, by transformation of the round cells intospindle-shaped cicatrix cells, the soft polypus receives ahard fibrous character. This transformation proceedsirregularly from the root to the body of the polypus. Hartmann 4 considers that a granulation growth maydevelop into a fibroma by the cellular elements develop-ing into spindle-cells and connective-tissue fibres, someof the blood-vessels becoming obliterated. J. B. Weydner, 5 of Munich, in a paper published, On the Structure of Aural Polypi, feels justified in as-serting that almost all aural polypi are generally noth-ing but granulation tumors, whose fate it is to be ulti-mately transformed into connective tissue. Only a fewof the polypi attain, however, any

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