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During the past two years I have been trying to assemble various groups of extrathoracic and intrathoracic tumors which have been reported in the literature. The incentive to do this was my agreement to write a chapter on thoracic tumors for new systems of surgery. In my early enthusiasm, the proposition did not seem so overwhelming, but as time has gone on, I wonder at my temerity in undertaking it. It soon became evident that certain tumors, for example the dermoid cysts of the mediastinum, are clearly defined pathologically, are well reported, as a rule, and do not offer any particular difficulties to one trying to assemble them. On the other hand, information concerning the pathology of other groups of tumors is in such a confused state that little of value results from their study. I have spent as long as three or four months on a single group of