Petitioners, husband and wife, stand convicted under ? 145 of the Internal Revenue Code of an attempt to evade and defeat their income taxes for the year 1948. The prosecution was based on the net worth method of proof, also in issue in three companion cases and a number of other decisions here from the Courts of Appeals of nine circuits. During the past two decades this Court has been asked to review an increasing number of criminal cases in which proof of tax evasion rested on this theory. We have denied certiorari because the cases involved only questions of evidence and, in isolation, presented no important questions of law. In 1943 the Court did have occasion to pass upon an application of the net worth theory where the taxpayer had no records. United States v. Johnson, 319 U.S. 503.