In a former communication, I1 suggested a method for the roentgen study of the large interlobar fissures which was cited in the German literature by Holzknecht,2 later by Eisler3 and by Wimberger,4 and which was elaborated in detail by Fleischner.5 This method is not in common usage, and it is for this reason that cases are presented to illustrate the technic which deserves reintroduction into American usage.
ANATOMY
The Left Interlobar Fissure.—The left interlobar fissure may be represented by a line beginning from 6 to 8 cm. below the apex at about the level of the third dorsal vertebra, extending from the posterior margin of the medial surface of the lung, backward and slightly upward to the posterior surface, then arching slightly over the posterior convexity and downward; it crosses the fourth interspace in the midaxillary line, to the level of the sixth costal