ATTENTIVE READERS found several errors and omissions in Weekend's March 7 feature on former Washington area residences of U.S. presidents.

* The 1805 Monroe-Adams-Abbe House at 2017 I Street NW, home to a notable collection of early 20th-century American artists, is open to the public, free, except on Mondays.

The hours are 1 to 5 Saturday and Sunday, 2 to 5 Wednesday, and 10 to 5 Tuesday, Thursday and Friday. Opening Sunday at the gallery, owned since 1916 by the Arts Club of Washington, will be "Finnish Icons" by Iisa Makela; the exhibit will run through April 18.

* We gave a Rhode Island Avenue address for The Warwick, which stood at 3051 Idaho Avenue NW when Harry S Truman lived in it, and stands there still, as resident Daniel J. Stein assures us.

* And while Chester A. Arthur's Washington digs are gone, they're not frgotten, chides historian/photographer Jerry A. McCoy. Arthur spent the first few months of his administration in 1881 at "Gray House," built by Union Gen. Ben "Beast" Butler on a site now covered by the Longworth Building.

A National Park Service historian notes that earlier the same year, while still vice president, Arthur lived in a long-since demolished house at 704 14th Street NW.