To the Editor.—I read with inter[ill] the study by Hanson1 published [ill] Archives on propylthiouracil [ill] hepatitis. In that article there i table citing my article2 showing time to onset of hepatitis as months. In the body of the discussio also shows that the onset of sympto ranged from two weeks to 6.5 mon after the institution of propylt[ill] uracil therapy. This is in error, as w[ill] the article actually said is that months prior to being seen, the pati was started on propylthiouracil th[ill] apy. Therefore, the onset should [ill] be 2.5 months, not 6.5 months.