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The literature on occlusive thrombi of the auricles has been reviewed in order to identify the symptom complex attributed to this condition. The clinicopathological findings are presented in four new cases which fit this symptom complex. Two cases are notable in that one is that of a ball thrombus occurring in the absence of mitral stenosis and another the first reported case of pedunculated thrombus of the right auricle.

Gross and microscopic studies of the auriculoventricular conduction system were performed in 60 human hearts. A unique technic is introduced which will produce a photographic. record of undistorted serial sections through a block containing the auriculoventricular node, auriculoventricular bundle and branches. By projecting the completed film as a motion picture, the course and changing relationships of component structures can be followed from level to level in uninterrupted sequence. The neurogenic versus the myogenic concept of cardiac conduction is reviewed at length.