A federal court jury of eight women and four men yesterday considered the fraud and conspiracy case against Mary Treadwell for nearly six hours, but failed for the second day to reach a verdict.

The jury, which started deliberations on Saturday, has now discussed the case for more than 12 hours and will continue deliberations this morning. As the jurors quit for the day late yesterday afternoon, they gave no hint of their progress.

At the start of their deliberations yesterday, the jurors were handed the estimated 400 government reports, documents, bank checks, memos and notes that were introduced as evidence by prosecution and defense attorneys during the six-week trial. The jurors had asked to see the exhibits at the end of their deliberations Saturday.

Treadwell is former head of P.I. Properties Inc., a now-defunct real estate firm that owned the Clifton Terrace apartment complex in the mid-1970s. She is accused of defrauding the federal government and the impoverished Clifton Terrace tenants of thousands of dollars. In addition to fraud and conspiracy, she is accused of three counts of tax evasion counts and of making 16 false statements to two federal agencies.

One of the documents sought by the jurors was a timetable prepared by Treadwell's defense attorneys that showed when various events occurred at Clifton Terrace and how Treadwell purportedly spent considerable time during P.I. Properties' ownership of the apartment complex working on her other business ventures.

Treadwell testified about the chart, but John W. Nields Jr., Treadwell's court-appointed defense attorney, did not seek to have it admitted as evidence at the time she discussed it.

Yesterday, when he realized the jury wanted to see it, Nields sought to have the chart declared evidence in the trial and sent to the jury. Nields said there was a "substantial risk of prejudicing the defense" if the jurors could not study the chart.

But Assistant U.S. Attorney Melanie G. Dorsey objected, saying that to slip the chart into the jury room as a single piece of evidence would unjustly highlight it.

Penn denied Nields' motion.