The Journal has frequently emphasized the manner in which years of patient investigation precede each significant announcement of a medical discovery. In the year just past, Americans interested in roentgenologic diagnosis have read several such announcements.
Widest notice, perhaps, has been given to intravenous urography, the procedure by which roentgenograms of the urinary tract can be made after intravenous injection of Iopax (sodium 2-oxo-5-iodo-pyridine-N-acetate, introduced as "Uroselectan").1 This work was begun in Germany by Lichtwitz, by Binz and by von Lichtenberg. Working at one time with Lichtwitz and later with von Lichtenberg, Swick, an American graduate student resident in Germany, applied the substance developed by Binz as a contrast medium in urologic diagnosis. Clinical trials were made in the United States and the results recently have been summarized in The Journal.
Less widely known as yet, but probably of equal importance, is an announcement by Weber.2 He applied,