“…was first introduced by Hanger in 1938, and since that time has been studied and used considerably in North America and, to a smaller extent, in Britain. The results and conclusions have been published by Hanger (1939), Pohle andStewart (1941), Hanger andPatek (1941), Gutman and Hanger (1941), Rosenberg (1941) Yardumian andWeisband (1943), andDick (1945). The consensus of opinion is that it is a sensitive means of demonstrating disease of the liver parenchyma cells.…”