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A a 6Womreatinagedt6.wetetanglomus telndvsumoture in hnumofmal gutaaortic glypnode.Th tumourscll (lmninms as they are ordinarily seen. Although not well seen at this magnification, the tumour cells have the features of glomus cells, wsth rather small deeply stained nucleus and distinct but relatively narrow cytoplasmsc rim. (Haematoxylin-eosin. x 160.)

sounds and cannot be silenced until the oxygen runs out of the cylinder or pipeline completely. The button can be reset when a full cylinder is installed or pipeline pressure re-established. The patient failsafe system consists of pipelines connected from the oxygen regulators to each of the other gas regulators, the oxygen pressure acting in place of the usual spring. When oxygen fails the regulators shut off. At the same time as the supply of gases is cut of from the patient an inspiratory valve (which is normally kept closed by these gases) is allowed to vent to atmosphere, ensuring that the patient can still breathe.-I

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